Use feature test to expose setenv
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As per the [man page](https://man7.org/linux/man-pages/man3/setenv.3.html), `setenv` requires `_POSIX_C_SOURCE` >= 200112L to be defined before including the appropriate header file (`stdlib.h`). As the other included header files include some standard headers transitively, this needs to go above all includes.
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As per the man page,
setenvrequires_POSIX_C_SOURCE>= 200112L to be definedbefore including the appropriate header file (
stdlib.h). As theother included header files include some standard headers
transitively, this needs to go above all includes.