[CRT] Correctly share get_ioinfo()/release_ioinfo() functions between code units

[CRT] Correctly share get_ioinfo()/release_ioinfo() functions between code units

This fixes the following compiler errors:

../sdk/lib/crt/stdio/stat64.c:7:13: error: inline function 'release_ioinfo' declared but never defined [-Werror]
 inline void release_ioinfo(ioinfo *info);
             ^~~~~~~~~~~~~~
../sdk/lib/crt/stdio/stat64.c:6:16: error: inline function 'get_ioinfo' declared but never defined [-Werror]
 inline ioinfo* get_ioinfo(int fd);
                ^~~~~~~~~~
../sdk/lib/crt/stdio/file.c:186:5: error: 'init_ioinfo_cs' is static but used in inline function 'get_ioinfo' which is not static [-Werror]
     init_ioinfo_cs(ret);
     ^~~~~~~~~~~~~~
../sdk/lib/crt/stdio/file.c:183:19: error: 'get_ioinfo_nolock' is static but used in inline function 'get_ioinfo' which is not static [-Werror]
     ioinfo *ret = get_ioinfo_nolock(fd);