Intel-C: declare support for gnu11
Without extensions, functions like `strdup` are not available since they are actually controlled by feature flags such as _SVID_SOURCE and _BSD_SOURCE. When using `-std=c11` on Intel, none of these flags are set, so the functions are not declared properly leading to compile errors. Reported-by: Adam J. Stewart <ajstewart426@gmail.com> Closes: #16226
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@ -16,7 +16,7 @@ endif()
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if (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 15.0.0)
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set(CMAKE_C11_STANDARD_COMPILE_OPTION "${_std}=c11")
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set(CMAKE_C11_EXTENSION_COMPILE_OPTION "${_std}=c11")
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set(CMAKE_C11_EXTENSION_COMPILE_OPTION "${_std}=gnu11")
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endif()
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if (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 12.1)
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