fix: linux未链接m和stdc++库, 造成编译失败问题

Author: ydajiang

header.go

@@ -5,6 +5,6 @@ package audio_transcoder
 /*
 #cgo CFLAGS: -I./3rd/wrapper -I./3rd/include
 #cgo windows,amd64 LDFLAGS: -L./3rd/lib/win64 -lfaad -lfaac -lopus
-#cgo linux,amd64 LDFLAGS: -L./3rd/lib/linux64 -lfaad -lfaac -lopus
+#cgo linux,amd64 LDFLAGS: -L./3rd/lib/linux64 -lfaad -lfaac -lopus -lm -lstdc++
 */
 import "C"