Incorporate bsdmake into buildsystem and reorganize libs

lib/libsys/sys_exec.c

@@ -0,0 +1,18 @@
+#include "syslib.h"
+
+PUBLIC int sys_exec(proc_ep, ptr, prog_name, initpc)
+endpoint_t proc_ep;		/* process that did exec */
+char *ptr;			/* new stack pointer */
+char *prog_name;		/* name of the new program */
+vir_bytes initpc;
+{
+/* A process has exec'd.  Tell the kernel. */
+
+  message m;
+
+  m.PR_ENDPT = proc_ep;
+  m.PR_STACK_PTR = ptr;
+  m.PR_NAME_PTR = prog_name;
+  m.PR_IP_PTR = (char *)initpc;
+  return(_kernel_call(SYS_EXEC, &m));
+}