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fix command execution

	- replace fork() call with rfork() including RFNOTEG to prevent notes being
	propagated to the parent process and killing unwanted stuff
	- replace call to exit() with _exit() to prevent calling atexit() functions
	and also killing unwanted stuff
	- do not redirect command output ourselves as VIM is actually redirecting
	to temporary files and then using these files

--- a/os_plan9.c

+++ b/os_plan9.c

@@ -1154,38 +1154,27 @@

 }

 #endif

-int mch_call_shell(char_u *cmd, int options) {

-    USED(options);

-    int p[2];

-    int pid;

+int

+mch_call_shell(char_u *cmd, int options)

+{

+    pid_t pid;

     int status;

-    status = FAIL;

-    if(pipe(p) < 0) {

-	return FAIL;

-    }

-    pid = rfork(RFPROC|RFFDG|RFENVG);

-    switch(pid) {

-    case -1:

-	close(p[0]);

-	close(p[1]);

-	return FAIL;

-    case 0:

-	close(p[0]);

-	dup2(p[1], 1);

-	dup2(2, 1);

-	if (cmd) {

-	    execl("/bin/rc", "rc", "-c", (char*)cmd, NULL);

-	} else {

+    if(options & SHELL_COOKED)

+	settmode(TMODE_COOK);

+

+    pid = rfork(RFPROC|RFFDG|RFENVG|RFNOTEG);

+    if(pid < 0)

+	return -1;

+    if(pid == 0){

+	if (cmd) 

+	    execl("/bin/rc", "rc", "-c", cmd, NULL);

+	 else 

 	    execl("/bin/rc", "rc", NULL);

-	}

-	exit(122);

-	break;

-    case 1:

-	waitpid(pid, &status, 0);

-	close(p[0]);

-	close(p[1]);

-	break;

+	

+	_exit(122);

     }

+    waitpid(pid, &status, 0);

     return status;

 }

+