[openwrt/openwrt] lua: add -ldl for glibc builds

[LEDE Commits]

aparcar pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/980dca6b7f657846a74b2e069ee120014a4c4137

commit 980dca6b7f657846a74b2e069ee120014a4c4137
Author: Rosen Penev <rosenp at gmail.com>
AuthorDate: Sat Jan 2 15:56:25 2021 -0800

    lua: add -ldl for glibc builds
    
    For glibc, lua needs an explicit link to libdl as glibc has it separate
    
    Fixes the following error in at least collectd:
    
    ld: usr/lib/liblua.so: undefined reference to `dlopen'
    ld: usr/lib/liblua.so: undefined reference to `dlclose'
    ld: usr/lib/liblua.so: undefined reference to `dlerror'
    ld: usr/lib/liblua.so: undefined reference to `dlsym'
    
    Signed-off-by: Rosen Penev <rosenp at gmail.com>
---
 package/utils/lua/Makefile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/package/utils/lua/Makefile b/package/utils/lua/Makefile
index 3cdb2bcdb6..a54ef7d25a 100644
--- a/package/utils/lua/Makefile
+++ b/package/utils/lua/Makefile
@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=lua
 PKG_VERSION:=5.1.5
-PKG_RELEASE:=7
+PKG_RELEASE:=8
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=http://www.lua.org/ftp/ \
@@ -99,7 +99,7 @@ define Build/Compile
 		RANLIB="$(TARGET_CROSS)ranlib" \
 		INSTALL_ROOT=/usr \
 		CFLAGS="$(TARGET_CPPFLAGS) $(TARGET_CFLAGS)" \
-		MYLDFLAGS="$(TARGET_LDFLAGS) $(if $(CONFIG_USE_GLIBC),-lm)" \
+		MYLDFLAGS="$(TARGET_LDFLAGS) $(if $(CONFIG_USE_GLIBC),-lm -ldl)" \
 		PKG_VERSION=$(PKG_VERSION) \
 		linux
 	rm -rf $(PKG_INSTALL_DIR)