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: caee63afe878fe2ec7dbba394a86c9654d9110ca@941 64e312b2-a51f-0410-8e61-82d0ca0eb02a

svn2github/check,dashaomai/check-code,dashaomai/check-code,svn2github/check,dashaomai/check-code,svn2github/check,svn2github/check,svn2github/check,dashaomai/check-code