compiler: pass -cflags to thirdparty building stage too

compiler/cc.v

@@ -369,17 +369,23 @@ fn find_c_compiler_default() string {
 }
 
 fn find_c_compiler_thirdparty_options() string {
-	if '-m32' in os.args{
-		$if windows {
-			return '-m32'
-		}$else{
-			return '-fPIC -m32'
-		}
-	}else{
-		$if windows {
-			return ''
-		}$else{
-			return '-fPIC'
+	fullargs := env_vflags_and_os_args()
+	mut cflags := get_cmdline_cflags( fullargs )
+	$if !windows {
+		cflags += ' -fPIC'
 	}
+	if '-m32' in fullargs {
+		cflags += ' -m32'
 	}
+	return cflags
+}
+
+fn get_cmdline_cflags(args []string) string {
+	mut cflags := ''
+	for ci, cv in args {
+		if cv == '-cflags' {
+			cflags += args[ci+1] + ' '
+		}
+	}
+	return cflags
 }

compiler/main.v

@@ -849,12 +849,7 @@ fn new_v(args[]string) &V {
 			files << f
 		}
 
-	mut cflags := ''
-	for ci, cv in args {
-		if cv == '-cflags' {
-			cflags += args[ci+1] + ' '
-		}
-	}
+	cflags := get_cmdline_cflags(args)
 
 	rdir := os.realpath( dir )
 	rdir_name := os.filename( rdir )