[Bug bootstrap/43714] missing check for zlib.h, fails to build lto-compress.c

[developm...@faf-ltd.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=43714

Peter VARGA <developm...@faf-ltd.com> changed:

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--- Comment #3 from Peter VARGA <developm...@faf-ltd.com> ---
But is this really that big deal to check it in configure? There are checked so
many conditions and a missing zlib.h causes the compilation to fail.