qt: use patch over sed for guix CROSS_LIBRARY_PATH change

depends/packages/qt.mk

@@ -21,6 +21,7 @@ $(package)_patches += use_android_ndk23.patch
 $(package)_patches += rcc_hardcode_timestamp.patch
 $(package)_patches += duplicate_lcqpafonts.patch
 $(package)_patches += fast_fixed_dtoa_no_optimize.patch
+$(package)_patches += guix_cross_lib_path.patch
 
 $(package)_qttranslations_file_name=qttranslations-$($(package)_suffix)
 $(package)_qttranslations_sha256_hash=c92af4171397a0ed272330b4fa0669790fcac8d050b07c8b8cc565ebeba6735e
@@ -252,6 +253,7 @@ define $(package)_preprocess_cmds
   patch -p1 -i $($(package)_patch_dir)/rcc_hardcode_timestamp.patch && \
   patch -p1 -i $($(package)_patch_dir)/duplicate_lcqpafonts.patch && \
   patch -p1 -i $($(package)_patch_dir)/fast_fixed_dtoa_no_optimize.patch && \
+  patch -p1 -i $($(package)_patch_dir)/guix_cross_lib_path.patch && \
   mkdir -p qtbase/mkspecs/macx-clang-linux &&\
   cp -f qtbase/mkspecs/macx-clang/qplatformdefs.h qtbase/mkspecs/macx-clang-linux/ &&\
   cp -f $($(package)_patch_dir)/mac-qmake.conf qtbase/mkspecs/macx-clang-linux/qmake.conf && \
@@ -261,8 +263,7 @@ define $(package)_preprocess_cmds
   echo "!host_build: QMAKE_CXXFLAGS   += $($(package)_cxxflags) $($(package)_cppflags)" >> qtbase/mkspecs/common/gcc-base.conf && \
   echo "!host_build: QMAKE_LFLAGS     += $($(package)_ldflags)" >> qtbase/mkspecs/common/gcc-base.conf && \
   sed -i.old "s|QMAKE_CC                = \$$$$\$$$${CROSS_COMPILE}clang|QMAKE_CC                = $($(package)_cc)|" qtbase/mkspecs/common/clang.conf && \
-  sed -i.old "s|QMAKE_CXX               = \$$$$\$$$${CROSS_COMPILE}clang++|QMAKE_CXX               = $($(package)_cxx)|" qtbase/mkspecs/common/clang.conf && \
-  sed -i.old "s/LIBRARY_PATH/(CROSS_)?\0/g" qtbase/mkspecs/features/toolchain.prf
+  sed -i.old "s|QMAKE_CXX               = \$$$$\$$$${CROSS_COMPILE}clang++|QMAKE_CXX               = $($(package)_cxx)|" qtbase/mkspecs/common/clang.conf
 endef
 
 define $(package)_config_cmds

depends/patches/qt/guix_cross_lib_path.patch

@@ -0,0 +1,17 @@
+Facilitate guix building with CROSS_LIBRARY_PATH
+
+See discussion in https://github.com/bitcoin/bitcoin/pull/15277.
+
+--- a/qtbase/mkspecs/features/toolchain.prf
++++ b/qtbase/mkspecs/features/toolchain.prf
+@@ -231,8 +231,8 @@ isEmpty($${target_prefix}.INCDIRS) {
+             add_libraries = false
+             for (line, output) {
+                 line ~= s/^[ \\t]*//  # remove leading spaces
+-                contains(line, "LIBRARY_PATH=.*") {
+-                    line ~= s/^LIBRARY_PATH=//  # remove leading LIBRARY_PATH=
++                contains(line, "(CROSS_)?LIBRARY_PATH=.*") {
++                    line ~= s/^(CROSS_)?LIBRARY_PATH=//  # remove leading (CROSS_)?LIBRARY_PATH=
+                     equals(QMAKE_HOST.os, Windows): \
+                         paths = $$split(line, ;)
+                     else: \