build: Ensure strchrnul() is available in header (fixes macOS build) #1660
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The strchrnul() function is also introduced in macOS 15.4, however, for macOS build, a compiler may default to building for an older macOS version (such as 15.0). The configure script can wrongly assume the function may be used.
Fix the configure script's detection of strchrnul() by ensuring it's actually available through the header.
Fixes: #1659