msgfmt: do not fail when --statistics is passed

po.m4 from gnulib/gettext uses a check that this option is supported
in order to exclude the FreeBSD implementation, and force the GNU version
on them.

http://git.savannah.gnu.org/cgit/gettext.git/tree/gettext-runtime/m4/po.m4?id=d9cfbdfecb502b70c55e594bc897c217ac082f5f#n37

it does so since several years, so it's funny we haven't hit that earlier.
however this now triggers for "deadbeef" in version 0.7.2.

src/msgfmt.c

@@ -234,14 +234,16 @@ int main(int argc, char**argv) {
 					streq(A+2, "check-accelerators") ||
 					streq(A+2, "no-hash") ||
 					streq(A+2, "verbose") ||
-					streq(A+2, "statistics") ||
 					strstarts(A+2, "check-accelerators=") ||
 					strstarts(A+2, "resource=") ||
 					strstarts(A+2, "locale=")
 
 				) {
 				} else if((dest = strstarts(A+2, "output-file="))) {
 					set_file(1, dest, &out);
+				} else if(streq(A+2, "statistics")) {
+					fprintf(stdout, "No Statistics available.\n");
+					return 0;
 				} else if(streq(A+2, "version")) {
 					version();
 				} else if(streq(A+2, "help")) syntax();