Guard _DEFAULT_SOURCE with #ifndef in src/api.c#422
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Guard the definition of _DEFAULT_SOURCE in src/api.c with #ifndef to prevent macro redefinition build errors when _DEFAULT_SOURCE or _GNU_SOURCE is already defined by the build environment (e.g. -D_GNU_SOURCE=1 or -D_DEFAULT_SOURCE=1).
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Fix build error:
cpuinfo/src/api.c:2:9: error: '_DEFAULT_SOURCE' macro redefined [-Werror,-Wmacro-redefined]
2 | #define _DEFAULT_SOURCE
| ^
add an #ifndef around the define
Fixes #171