testing/lua-rex: build with -fPIC

testing/lua-rex/APKBUILD

-# Contributor: 
-# Maintainer: 
+# Maintainer: Natanael Copa <ncopa@alpinelinux.org>
 pkgname=lua-rex
 pkgver=2.4.0
 pkgrel=1
@@ -16,7 +15,7 @@ _builddir="$srcdir"/lrexlib-$pkgver
 
 prepare() {
 	cd "$_builddir"
-	sed -i -e "s/^MYCFLAGS.*/MYCFLAGS = $CFLAGS/" src/defaults.mak
+	sed -i -e "s/^MYCFLAGS.*/MYCFLAGS = $CFLAGS -fPIC/" src/defaults.mak
 	sed -i -e "s/^LD .*/LD = gcc/" \
 		src/common.mak
 }