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Description of problem:
The re_comp and re_exec man pages suggest includeing <regex.h>
for re_comp and re_exec, but they don't tell you that you need
to define _REGEX_RE_COMP (or that these functions are probably
deprecated).

Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1.man re_exec
2.grep -5 re_exec /usr/include/regex.h
    

Actual Results:  21:56:turing 11% gcc -W -Wall -c re_test.c
re_test.c: In function `main':
re_test.c:12: warning: implicit declaration of function `re_comp'
re_test.c:12: warning: assignment makes pointer from integer without a cast
re_test.c:16: warning: implicit declaration of function `re_exec'


Expected Results:  21:57:turing 13% gcc -D_REGEX_RE_COMP -W -Wall -c re_test.c
21:57:turing 13%



Additional info:

Showed up while investigating
        http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=76594