qrcodegen: rebuild with -fPIC, patch Makefile

srcpkgs/qrcodegen/template

@@ -1,7 +1,7 @@
 # Template file for 'qrcodegen'
 pkgname=qrcodegen
 version=1.5.0
-revision=1
+revision=2
 wrksrc="QR-Code-generator-${version}"
 build_wrksrc="cpp"
 build_style=gnu-makefile
@@ -12,11 +12,6 @@ homepage="https://www.nayuki.io/page/qr-code-generator-library"
 distfiles="https://github.com/nayuki/QR-Code-generator/archive/v${version}.tar.gz"
 checksum=6cf993c10fbf96b5e8f8e4eaad8ea1ca3bbc58fb4d00a4728b4f818c27fb4d5e
 
-pre_build() {
-	vsed -i Makefile -e "s;\(CXXFLAGS += -Wall\) -fsanitize=undefined;\1;" \
-		-e "s; -O1;;"
-}
-
 do_install() {
 	sed -n "/^License/,/xxxx/p" ../Readme.markdown > LICENSE
 	vlicense LICENSE