regex: gnulib guarantees that we have regex support

No need to use HAVE_REGEX_H - our use of gnulib guarantees that
the header exists and works, regardless of platform.  Similarly,
we can unconditionally assume a compiling <sys/wait.h> (although
the mingw version of this header is not full-featured).

* src/storage/storage_backend.c: Drop useless conditional.
* tests/testutils.c: Likewise.

src/storage/storage_backend.c

@@ -25,9 +25,7 @@
 
 #include <string.h>
 #include <stdio.h>
-#if HAVE_REGEX_H
-# include <regex.h>
-#endif
+#include <regex.h>
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <unistd.h>

tests/testutils.c

 /*
  * testutils.c: basic test utils
  *
- * Copyright (C) 2005-2012 Red Hat, Inc.
+ * Copyright (C) 2005-2013 Red Hat, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -27,12 +27,8 @@
 #include <sys/time.h>
 #include <sys/types.h>
 #include <sys/stat.h>
-#ifndef WIN32
-# include <sys/wait.h>
-#endif
-#ifdef HAVE_REGEX_H
-# include <regex.h>
-#endif
+#include <sys/wait.h>
+#include <regex.h>
 #include <unistd.h>
 #include <string.h>
 #include <fcntl.h>
@@ -735,7 +731,6 @@ cleanup:
 }
 
 
-#ifdef HAVE_REGEX_H
 int virtTestClearLineRegex(const char *pattern,
                            char *str)
 {
@@ -779,10 +774,3 @@ int virtTestClearLineRegex(const char *pattern,
 
     return 0;
 }
-#else
-int virtTestClearLineRegex(const char *pattern ATTRIBUTE_UNUSED,
-                           char *str ATTRIBUTE_UNUSED)
-{
-    return 0;
-}
-#endif