font: initialise fontconfig ourselves

fontconfig 2.16 warns on every start when Pango reaches it before
FcInit(); calling it first keeps stderr quiet.

font.c

@@ -1,4 +1,5 @@
 #include "dat.h"
+#include <fontconfig/fontconfig.h>
 #include <pango/pangocairo.h>
 #include "fn.h"
 
@@ -53,6 +54,7 @@ int
 textinit(void)
 {
 	textclose();
+	FcInit();
 	fontmap = pango_cairo_font_map_new();
 	if(fontmap == nil){
 		fprint(2, "strans: popup: can't initialize PangoCairo\n");