remove postinst script

package/libpthread/Makefile

@@ -36,6 +36,7 @@ libpthread-install:
 ifeq ($(ADK_TARGET_LIB_MUSL),)
 	${INSTALL_DIR} ${IDIR_LIBPTHREAD}/$(ADK_TARGET_LIBC_PATH)
 	${CP} ${STAGING_TARGET_DIR}/lib/libpthread*.so* ${IDIR_LIBPTHREAD}/$(ADK_TARGET_LIBC_PATH)
+	(cd ${IDIR_LIBPTHREAD}/$(ADK_TARGET_LIBC_PATH); ln -sf libpthread.so.0 libpthread.so)
 endif
 
 include ${TOPDIR}/mk/pkg-bottom.mk

package/libpthread/files/libpthread.postinst

@@ -1,4 +0,0 @@
-#!/bin/sh
-if [ ! -z $IPKG_INSTROOT ];then 
-	(cd $IPKG_INSTROOT/lib && ln -sf libpthread.so.0 libpthread.so)
-fi