getconf has the capability to do a runtime check for environment
support in cases where there is optional support for an environment
(_POSIX_V7_ILP32_OFF32 on x86_64 for example) and this is indicated by
not defining the _POSIX_V7_ILP32_OFF32 macro, which results in getconf
doing an additional execve of _POSIX_V7_ILP32_OFF32 in the
$GETCONF_DIR.
The default bits/environments.h however does not leave any environment
macros undefined, which means that no such additional execve is
needed. gcc trunk catches this as a build failure since it finds that
the code block inside switch(specs[i].num) is not reachable. Avoid
this error by not bothering about the additional exec (and looking in
specific environments) when all environments are defined.
Tested on aarch64.
* posix/getconf.c: Define ALL_ENVIRONMENTS_DEFINED if all
environment macros are defined.
(main): Avoid execve if ALL_ENVIRONMENTS_DEFINED is defined.
