fix(utils): handle warning flags in header-only mode #3

Job	Run time
Configuration Coverage	34s
Standalone Package Export Check	31s
Static Analysis	46s
Runtime Smoke Checks	37s
Valgrind Checks	45s
Build (clang, header_only=OFF, examples=ON, provider=system)	35s
Build (clang, header_only=OFF, examples=ON, provider=fallback)	55s
Build (clang, header_only=ON, examples=OFF, provider=fallback)	45s
Build (clang, header_only=ON, examples=ON, provider=fallback)	46s
Build (clang, header_only=OFF, examples=OFF, provider=system)	27s
Build (clang, header_only=ON, examples=OFF, provider=system)	35s
Build (gcc, header_only=ON, examples=ON, provider=system)	31s
Build (gcc, header_only=OFF, examples=ON, provider=system)	31s
Build (clang, header_only=OFF, examples=OFF, provider=fallback)	45s
Build (gcc, header_only=ON, examples=ON, provider=fallback)	40s
Build (gcc, header_only=OFF, examples=ON, provider=fallback)	48s
Build (clang, header_only=ON, examples=ON, provider=system)	24s
Build (gcc, header_only=ON, examples=OFF, provider=fallback)	47s
Build (gcc, header_only=OFF, examples=OFF, provider=system)	38s
Build (gcc, header_only=OFF, examples=OFF, provider=fallback)	46s
Build (gcc, header_only=ON, examples=OFF, provider=system)	27s
Utils Strict CI Summary	3s
	13m 36s

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