Include assert.h from qemu-common.h

Include assert.h from qemu-common.h and remove other direct uses.
cpu-all.h still need to include it because of the dyngen-exec.h hacks

Signed-off-by: Paul Brook <paul@codesourcery.com>
diff --git a/qemu-common.h b/qemu-common.h
index b2e2829..ee4a672 100644
--- a/qemu-common.h
+++ b/qemu-common.h
@@ -23,6 +23,7 @@
 #include <unistd.h>
 #include <fcntl.h>
 #include <sys/stat.h>
+#include <assert.h>
 #include "config-host.h"
 
 #ifndef O_LARGEFILE