Don't quote too much. Now autoconf-2.13 is happy again.

Sascha Schumann · Sascha Schumann · commit d9f36aed9fca · 2002-03-20T11:49:36.000Z
diff --git a/acinclude.m4 b/acinclude.m4
@@ -1341,10 +1341,10 @@ AC_DEFUN(PHP_CHECK_LIBRARY, [
   LDFLAGS="$5 $LDFLAGS"
   AC_CHECK_LIB([$1],[$2],[
     LDFLAGS=$save_old_LDFLAGS
-    [$3]
+    $3
   ],[
     LDFLAGS=$save_old_LDFLAGS
-    [$4]
+    $4
   ])dnl
 ])
 
