configure: don't use -lintl when there is no gettext support

The current configure script uses -lintl if gettext is not found in the C
library, but does so before checking if there is libintl.h available in
the first place, in which case we would later define NO_GETTEXT.

Instead, check for the existence of libintl.h first. Only when libintl.h
exists and libintl is not in libc, ask for -lintl.

Signed-off-by: John Szakmeister <john@szakmeister.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

configure.ac

@@ -640,7 +640,18 @@ AC_CHECK_LIB([c], [gettext],
 [LIBC_CONTAINS_LIBINTL=YesPlease],
 [LIBC_CONTAINS_LIBINTL=])
 AC_SUBST(LIBC_CONTAINS_LIBINTL)
-test -n "$LIBC_CONTAINS_LIBINTL" || LIBS="$LIBS -lintl"
+
+#
+# Define NO_GETTEXT if you don't want Git output to be translated.
+# A translated Git requires GNU libintl or another gettext implementation
+AC_CHECK_HEADER([libintl.h],
+[NO_GETTEXT=],
+[NO_GETTEXT=YesPlease])
+AC_SUBST(NO_GETTEXT)
+
+if test -z "$NO_GETTEXT"; then
+    test -n "$LIBC_CONTAINS_LIBINTL" || LIBS="$LIBS -lintl"
+fi
 
 ## Checks for header files.
 AC_MSG_NOTICE([CHECKS for header files])
@@ -824,13 +835,6 @@ AC_CHECK_HEADER([paths.h],
 [HAVE_PATHS_H=])
 AC_SUBST(HAVE_PATHS_H)
 #
-# Define NO_GETTEXT if you don't want Git output to be translated.
-# A translated Git requires GNU libintl or another gettext implementation
-AC_CHECK_HEADER([libintl.h],
-[NO_GETTEXT=],
-[NO_GETTEXT=YesPlease])
-AC_SUBST(NO_GETTEXT)
-#
 # Define HAVE_LIBCHARSET_H if have libcharset.h
 AC_CHECK_HEADER([libcharset.h],
 [HAVE_LIBCHARSET_H=YesPlease],