Try to work around ubuntu gcc-5 ubsan build failure

[extended tests]

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6360)

.travis.yml

@@ -93,16 +93,16 @@ matrix:
         - os: linux
           compiler: clang
           env: EXTENDED_TEST="yes" CONFIG_OPTS="no-asm enable-asan enable-rc5 enable-md2 no-shared -DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION -D__NO_STRING_INLINES -Wno-unused-command-line-argument"
-        #- os: linux
-        #  addons:
-        #      apt:
-        #          packages:
-        #              - gcc-5
-        #              - g++-5
-        #          sources:
-        #              - ubuntu-toolchain-r-test
-        #  compiler: gcc-5
-        #  env: EXTENDED_TEST="yes" CONFIG_OPTS="--debug no-asm enable-ubsan enable-rc5 enable-md2 -DPEDANTIC" OPENSSL_TEST_RAND_ORDER=0
+        - os: linux
+          addons:
+              apt:
+                  packages:
+                      - gcc-5
+                      - g++-5
+                  sources:
+                      - ubuntu-toolchain-r-test
+          compiler: gcc-5
+          env: UBUNTU_GCC_HACK="yes" EXTENDED_TEST="yes" CONFIG_OPTS="--debug no-asm enable-ubsan enable-rc5 enable-md2 -DPEDANTIC" OPENSSL_TEST_RAND_ORDER=0
         - os: linux
           addons:
               apt:
@@ -141,6 +141,10 @@ before_script:
           srcdir=.;
           top=.;
       fi
+    - if [ -n "$UBUNTU_GCC_HACK" ]; then
+          $CC -dumpspecs | sed "s/--push-state//g; s/--pop-state/--as-needed/g" > gcc-specs.txt;
+          CC="$CC -specs=gcc-specs.txt";
+      fi
     - if [ "$CC" = i686-w64-mingw32-gcc ]; then
           export CROSS_COMPILE=${CC%%gcc}; unset CC;
           $srcdir/Configure mingw $CONFIG_OPTS -Wno-pedantic-ms-format;