cmake/Find: set <Modulename>_FOUND for compatibility when found via pkg-config

For Find modules where `<Modulename>` is not fully uppercase.

`<Modulename>` is case-exact name used in the Find modules filename:
`CMake/Find<Moduleame>.cmake`.

`find_package_handle_standard_args()` sets both `<MODULENAME>_FOUND` and
`<Modulename>_FOUND` when detecting the dependency. Some CMake code
relies on this and 3rd-party code may rely on it too. Make sure to set
the latter variant when detecting the dependency via `pkg-config`, where
we don't call `find_package_handle_standard_args()`.

CMake sets these variable to `TRUE` (not `ON` or `1`). Replicate this
for compatibility.

Closes #16153

CMake/FindBrotli.cmake

@@ -51,6 +51,7 @@ if(CURL_USE_PKGCONFIG AND
 endif()
 
 if(BROTLI_FOUND AND BROTLIDEC_FOUND)
+  set(Brotli_FOUND TRUE)
   list(APPEND BROTLIDEC_LIBRARIES ${BROTLI_LIBRARIES})  # order is significant: brotlidec then brotlicommon
   list(REVERSE BROTLIDEC_LIBRARIES)
   list(REMOVE_DUPLICATES BROTLIDEC_LIBRARIES)

CMake/FindCares.cmake

@@ -48,6 +48,7 @@ if(CURL_USE_PKGCONFIG AND
 endif()
 
 if(CARES_FOUND)
+  set(Cares_FOUND TRUE)
   string(REPLACE ";" " " CARES_CFLAGS "${CARES_CFLAGS}")
   message(STATUS "Found Cares (via pkg-config): ${CARES_INCLUDE_DIRS} (found version \"${CARES_VERSION}\")")
 else()

CMake/FindLibgsasl.cmake

@@ -48,6 +48,7 @@ if(CURL_USE_PKGCONFIG AND
 endif()
 
 if(LIBGSASL_FOUND)
+  set(Libgsasl_FOUND TRUE)
   string(REPLACE ";" " " LIBGSASL_CFLAGS "${LIBGSASL_CFLAGS}")
   message(STATUS "Found Libgsasl (via pkg-config): ${LIBGSASL_INCLUDE_DIRS} (found version \"${LIBGSASL_VERSION}\")")
 else()

CMake/FindLibidn2.cmake

@@ -48,6 +48,7 @@ if(CURL_USE_PKGCONFIG AND
 endif()
 
 if(LIBIDN2_FOUND)
+  set(Libidn2_FOUND TRUE)
   string(REPLACE ";" " " LIBIDN2_CFLAGS "${LIBIDN2_CFLAGS}")
   message(STATUS "Found Libidn2 (via pkg-config): ${LIBIDN2_INCLUDE_DIRS} (found version \"${LIBIDN2_VERSION}\")")
 else()

CMake/FindLibpsl.cmake

@@ -48,6 +48,7 @@ if(CURL_USE_PKGCONFIG AND
 endif()
 
 if(LIBPSL_FOUND AND LIBPSL_INCLUDE_DIRS)
+  set(Libpsl_FOUND TRUE)
   string(REPLACE ";" " " LIBPSL_CFLAGS "${LIBPSL_CFLAGS}")
   message(STATUS "Found Libpsl (via pkg-config): ${LIBPSL_INCLUDE_DIRS} (found version \"${LIBPSL_VERSION}\")")
 else()

CMake/FindLibrtmp.cmake

@@ -48,6 +48,7 @@ if(CURL_USE_PKGCONFIG AND
 endif()
 
 if(LIBRTMP_FOUND AND LIBRTMP_INCLUDE_DIRS)
+  set(Librtmp_FOUND TRUE)
   string(REPLACE ";" " " LIBRTMP_CFLAGS "${LIBRTMP_CFLAGS}")
   message(STATUS "Found Librtmp (via pkg-config): ${LIBRTMP_INCLUDE_DIRS} (found version \"${LIBRTMP_VERSION}\")")
 else()

CMake/FindLibssh.cmake

@@ -48,6 +48,7 @@ if(CURL_USE_PKGCONFIG AND
 endif()
 
 if(LIBSSH_FOUND)
+  set(Libssh_FOUND TRUE)
   string(REPLACE ";" " " LIBSSH_CFLAGS "${LIBSSH_CFLAGS}")
   message(STATUS "Found Libssh (via pkg-config): ${LIBSSH_INCLUDE_DIRS} (found version \"${LIBSSH_VERSION}\")")
 else()

CMake/FindLibssh2.cmake

@@ -48,6 +48,7 @@ if(CURL_USE_PKGCONFIG AND
 endif()
 
 if(LIBSSH2_FOUND AND LIBSSH2_INCLUDE_DIRS)
+  set(Libssh2_FOUND TRUE)
   string(REPLACE ";" " " LIBSSH2_CFLAGS "${LIBSSH2_CFLAGS}")
   message(STATUS "Found Libssh2 (via pkg-config): ${LIBSSH2_INCLUDE_DIRS} (found version \"${LIBSSH2_VERSION}\")")
 else()

CMake/FindLibuv.cmake

@@ -48,6 +48,7 @@ if(CURL_USE_PKGCONFIG AND
 endif()
 
 if(LIBUV_FOUND)
+  set(Libuv_FOUND TRUE)
   string(REPLACE ";" " " LIBUV_CFLAGS "${LIBUV_CFLAGS}")
   message(STATUS "Found Libuv (via pkg-config): ${LIBUV_INCLUDE_DIRS} (found version \"${LIBUV_VERSION}\")")
 else()

CMake/FindMbedTLS.cmake

@@ -60,6 +60,7 @@ if(CURL_USE_PKGCONFIG AND
 endif()
 
 if(MBEDTLS_FOUND AND MBEDX509_FOUND AND MBEDCRYPTO_FOUND)
+  set(MbedTLS_FOUND TRUE)
   list(APPEND MBEDTLS_LIBRARIES ${MBEDX509_LIBRARIES} ${MBEDCRYPTO_LIBRARIES})
   list(REVERSE MBEDTLS_LIBRARIES)
   list(REMOVE_DUPLICATES MBEDTLS_LIBRARIES)

CMake/FindNettle.cmake

@@ -48,6 +48,7 @@ if(CURL_USE_PKGCONFIG AND
 endif()
 
 if(NETTLE_FOUND)
+  set(Nettle_FOUND TRUE)
   string(REPLACE ";" " " NETTLE_CFLAGS "${NETTLE_CFLAGS}")
   message(STATUS "Found Nettle (via pkg-config): ${NETTLE_INCLUDE_DIRS} (found version \"${NETTLE_VERSION}\")")
 else()

CMake/FindQuiche.cmake

@@ -48,6 +48,7 @@ if(CURL_USE_PKGCONFIG AND
 endif()
 
 if(QUICHE_FOUND)
+  set(Quiche_FOUND TRUE)
   string(REPLACE ";" " " QUICHE_CFLAGS "${QUICHE_CFLAGS}")
   message(STATUS "Found Quiche (via pkg-config): ${QUICHE_INCLUDE_DIRS} (found version \"${QUICHE_VERSION}\")")
 else()

CMake/FindRustls.cmake

@@ -48,6 +48,7 @@ if(CURL_USE_PKGCONFIG AND
 endif()
 
 if(RUSTLS_FOUND)
+  set(Rustls_FOUND TRUE)
   string(REPLACE ";" " " RUSTLS_CFLAGS "${RUSTLS_CFLAGS}")
   message(STATUS "Found Rustls (via pkg-config): ${RUSTLS_INCLUDE_DIRS} (found version \"${RUSTLS_VERSION}\")")
 else()

CMake/FindWolfSSL.cmake

@@ -57,6 +57,7 @@ if(CURL_USE_PKGCONFIG AND
 endif()
 
 if(WOLFSSL_FOUND)
+  set(WolfSSL_FOUND TRUE)
   string(REPLACE ";" " " WOLFSSL_CFLAGS "${WOLFSSL_CFLAGS}")
   message(STATUS "Found WolfSSL (via pkg-config): ${WOLFSSL_INCLUDE_DIRS} (found version \"${WOLFSSL_VERSION}\")")
 else()

CMake/FindZstd.cmake

@@ -57,6 +57,7 @@ if(CURL_USE_PKGCONFIG AND
 endif()
 
 if(ZSTD_FOUND)
+  set(Zstd_FOUND TRUE)
   string(REPLACE ";" " " ZSTD_CFLAGS "${ZSTD_CFLAGS}")
   message(STATUS "Found Zstd (via pkg-config): ${ZSTD_INCLUDE_DIRS} (found version \"${ZSTD_VERSION}\")")
 else()