Before this patch we added standard headers unconditionally to the global list of headers used for feature checks. This is unnecessary and also doesn't help CMake 'Generate' performance. This patch moves these headers to each feature check where they are actually needed. Stop using `stddef.h`, as it seems unnecessary. I've used autotools' `m4/curl-functions.m4` to figure out these dependencies. Also delete checking for the C89 standard header `time.h`, that I missed in the earlier commit. Ref: 96c29900bcec32dd6bc8e9857c8871ff4b8b8ed9 #11940 Closes #11951
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