Pass --wildcards to tar on build (rhbz#206841)

Tar no longer accepts globbing by default as it's incompatible with
traditional implementations:
http://lists.gnu.org/archive/html/bug-tar/2006-06/msg00001.html

Rpm needs to work with upstream tar really, the --wildcards option has been
supported since 2001 so older versions shouldn't suffer either.

build.c

@@ -161,7 +161,7 @@ static int buildForTarget(rpmts ts, const char * arg, BTA_t ba)
 	    /* Try again */
 	    (void) pclose(fp);
 
-	    sprintf(cmd, "%s < %s | tar xOvf - \\*.spec 2>&1 > %s",
+	    sprintf(cmd, "%s < %s | tar xOvf - --wildcards \\*.spec 2>&1 > %s",
 		    zcmds[res & 0x3], arg, tmpSpecFile);
 	    if (!(fp = popen(cmd, "r"))) {
 		rpmError(RPMERR_POPEN, _("Failed to open tar pipe: %m\n"));