Fix segfault on systems with broken locale support

--- dmenu.c.orig	2013-11-16 10:52:03.970786705 -0300
+++ dmenu.c	2013-11-18 16:07:45.422148846 -0300
@@ -5,6 +5,7 @@
 #include <string.h>
 #include <strings.h>
 #include <unistd.h>
+#include <locale.h>
 #include <X11/Xlib.h>
 #include <X11/Xatom.h>
 #include <X11/Xutil.h>
@@ -590,7 +591,13 @@
 	                    CWOverrideRedirect | CWBackPixel | CWEventMask, &swa);
 
 	/* open input methods */
-	xim = XOpenIM(dc->dpy, NULL, NULL, NULL);
+	if (!(xim = XOpenIM(dc->dpy, NULL, NULL, NULL))) {
+		fputs("dmenu: Failed to open input method\n", stderr);
+		/* Might be an issue with the locale */
+		setlocale(LC_ALL, "C");
+		if (!(xim = XOpenIM(dc->dpy, NULL, NULL, NULL)))
+			exit(1);
+	}
 	xic = XCreateIC(xim, XNInputStyle, XIMPreeditNothing | XIMStatusNothing,
 	                XNClientWindow, win, XNFocusWindow, win, NULL);