libcompat.h: Correct HAVE_SETENV
libcompat.h: Correct HAVE_SETENV

The configure.ac script will set HAVE_DECL_SETENV if setenv exists.
This must not have been working, as no setenv tests must have
been executing.

git-svn-id: d023f1085a36f7a677188d00334e37d38ffecf51@941 64e312b2-a51f-0410-8e61-82d0ca0eb02a

9fcc/check,libcheck/check,krichter722/check,libcheck/check,9fcc/check,brarcher/check,9fcc/check,krichter722/check,brarcher/check,libcheck/check,libcheck/check,9fcc/check,krichter722/check,krichter722/check,brarcher/check,brarcher/check,9fcc/check,libcheck/check,brarcher/check,krichter722/check