Add the #goo to allow use in C++.
Silence a few more warnings.
Strip down the mkfiles more.
Fix bug in X11 mouse handling, note groups.

include/fcall.h

diff --git a/include/fcall.h b/include/fcall.h
index 93f46d4..20ffe38 100644
--- a/include/fcall.h
+++ b/include/fcall.h
@@ -1,3 +1,8 @@
+#ifndef _FCALL_H_
+#define _FCALL_H_ 1
+#if defined(__cplusplus)
+extern "C" { 
+#endif
 /*
 #pragma	src	"/sys/src/libc/9sys"
 #pragma	lib	"libc.a"
@@ -118,3 +123,7 @@
 #pragma	varargck	type	"M"	ulong
 #pragma	varargck	type	"D"	Dir*
 */
+#if defined(__cplusplus)
+}
+#endif
+#endif