Makefile.mk: improve a GNU Make hack [ci skip]

Replace the hack of using `$() ` to represent a single space. The new
method silences the `--warn-undefined-variables` debug warning and it's
also a better-known form of solving this problem.

Reviewed-by: Jay Satiro
Closes #10031
This commit is contained in:
Viktor Szakats 2022-12-05 14:31:32 +00:00
parent 6b30f28875
commit 2b584fffce
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@ -324,7 +324,7 @@ ifdef WIN32
_LIBS += -lws2_32 -lcrypt32 -lbcrypt
endif
ifneq ($(findstring 11,$(subst $() ,,$(SSLLIBS))),)
ifneq ($(findstring 11,$(subst $(subst ,, ),,$(SSLLIBS))),)
CPPFLAGS += -DCURL_WITH_MULTI_SSL
endif