fix(utils): handle warning flags in header-only mode #4

Job	Run time
Standalone Package Export Check	34s
Runtime Smoke Checks	40s
Static Analysis	41s
Valgrind Checks	44s
Configuration Coverage	40s
Build (clang, header_only=OFF, examples=ON, provider=fallback)	43s
Build (clang, header_only=ON, examples=ON, provider=fallback)	38s
Build (clang, header_only=ON, examples=ON, provider=system)	27s
Build (clang, header_only=OFF, examples=ON, provider=system)	37s
Build (clang, header_only=ON, examples=OFF, provider=fallback)	46s
Build (clang, header_only=OFF, examples=OFF, provider=fallback)	45s
Build (gcc, header_only=ON, examples=ON, provider=fallback)	46s
Build (gcc, header_only=OFF, examples=OFF, provider=fallback)	38s
Build (gcc, header_only=ON, examples=OFF, provider=fallback)	45s
Build (gcc, header_only=OFF, examples=OFF, provider=system)	37s
Build (clang, header_only=ON, examples=OFF, provider=system)	26s
Build (gcc, header_only=ON, examples=ON, provider=system)	24s
Build (gcc, header_only=ON, examples=OFF, provider=system)	32s
Build (gcc, header_only=OFF, examples=ON, provider=system)	33s
Build (gcc, header_only=OFF, examples=ON, provider=fallback)	47s
Build (clang, header_only=OFF, examples=OFF, provider=system)	29s
Utils Strict CI Summary	2s
	13m 14s

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