vup: remove empty new line on unix

cmd/tools/vup.v

@@ -66,7 +66,7 @@ fn (app App) recompile_v() {
 		println('> recompiling v itself with `$vself` ...')
 	}        
 	if self_result := os.exec(vself) {
-		println(self_result.output)
+		println(self_result.output.trim_space())
 		if self_result.exit_code == 0 {
 			return
 		}

vlib/os/os_windows.c.v

@@ -281,7 +281,7 @@ pub fn exec(cmd string) ?Result {
 			break
 		}
 	}
-	soutput := read_data.str().trim_space()
+	soutput := read_data.str()
 	read_data.free()
 	exit_code := u32(0)
 	C.WaitForSingleObject(proc_info.h_process, C.INFINITE)