Add -D_FORTIFY_SOURCE=3 to CFLAGS if supported #192
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Currently we check for
-D_FORTIFY_SOURCE=2support using GCC version checks. Update this to use -D_FORTIFY_SOURCE=3 if supported by the toolchain.Don't use
ax_add_fortify_source.m4from the autoconf archive as originally planned because this macro leaves the setting unchanged if it has been configured in the compiler settings.This change will add
-D_FORTIFY_SOURCE=3to CFLAGS if supported (recent GCC and Clang versions) and, failing that, add-D_FORTIFY_SOURCE=2which will almost certainly be supported.