inttypes, stdint: add C++11 support C++11 says there's no need to define __STDC_CONSTANT_MACROS etc. when including inttypes.h and stdint.h. Support this change to the standard. * doc/posix-headers/inttypes.texi (inttypes.h): * doc/posix-headers/stdint.texi (stdint.h): Document this. * lib/inttypes.in.h (__STDC_FORMAT_MACROS) [! __cplusplus]: Define if not defined already, for the benefit of pre-C++11 hosts. Define the standard format macros (e.g., PRId8) always. * lib/stdint.in.h (__STDC_CONSTANT_MACROS, __STDC_LIMIT_MACROS): Likewise, if __cpluspus. Define the standard constant and limit macros (e.g., INT8_C, INT8_MAX) always. * m4/inttypes.m4 (gl_INTTYPES_INCOMPLETE): Do not define GL_TRIGGER_STDC_LIMIT_MACROS or __STDC_LIMIT_MACROS; no longer needed. * m4/stdint.m4 (gl_STDINT_H): Update comments about these macros. * tests/test-inttypes.c (__STDC_LIMIT_MACROS, __STDC_CONSTANT_MACROS) (__STDC_FORMAT_MACROS): Do not define, since we assume C++11 API now. * tests/test-stdint.c (__STDC_LIMIT_MACROS, __STDC_CONSTANT_MACROS): Likewise.