os api: flush_stdout => flush

vlib/compiler/main.v

@@ -848,7 +848,7 @@ pub fn (v &V) log(s string) {
 
 pub fn verror(s string) {
 	println('V error: $s')
-	os.flush_stdout()
+	os.flush()
 	exit(1)
 }
 

vlib/os/os.v

@@ -1074,7 +1074,12 @@ pub fn log(s string) {
 	println('os.log: ' + s)
 }
 
+[deprecated]
 pub fn flush_stdout() {
+	panic('Use `os.flush` instead of `os.flush_stdout`')
+}
+
+pub fn flush() {
 	C.fflush(stdout)
 }
 

vlib/v/scanner/scanner.v

@@ -1028,7 +1028,7 @@ pub fn (s &Scanner) error(msg string) {
 
 pub fn verror(s string) {
 	println('V error: $s')
-	os.flush_stdout()
+	os.flush()
 	exit(1)
 }