sys-apps/portage: don't fail on start of stage3 on clang macos

sys-apps/portage/files/portage-3.0.49-prefix-stage2.patch

@@ -0,0 +1,16 @@
+During first part of stage3, some programs are installed from EPREFIX/tmp to EPREFIX which break this qa check
+The check I'm adding is heavy-handed, but I don't know how to fix this better
+
+TODO: check whether portage-3.0.30-prefix-stack.patch fixes the same issue - I don't understand what that patch is doing
+
+--- a/bin/install-qa-check.d/05prefix
++++ b/bin/install-qa-check.d/05prefix
+@@ -95,6 +95,8 @@ install_qa_check_prefix() {
+ 				# reasons
+ 				sed -i -e '1s:^#! \?'"${line[0]}"':#!'"${EPREFIX}"${line[0]}':' "${rf}"
+ 				continue
++			elif [[ -n "${PORTAGE_OVERRIDE_EPREFIX}" ]] ; then
++				continue
+ 			else
+ 				# this is definitely wrong: script in ${PATH} and invalid shebang
+ 				echo "${fn#${D}}:${line[0]} (script ${fn##*/} installed in PATH but interpreter ${line[0]} not found)" \

sys-apps/portage/portage-3.0.49.ebuild

@@ -92,6 +92,7 @@ python_prepare_all() {
 		# disabled in 3.0.24: does not apply, while useful, rarely used if ever
 		# "${FILESDIR}"/${PN}-3.0.30-ebuildshell.patch # 155161
 		"${FILESDIR}"/${PN}-3.0.55.1-interrevisions.patch # 832062
+		"${FILESDIR}"/${PN}-3.0.49-prefix-stage2.patch # 758167
 	)
 
 	distutils-r1_python_prepare_all

sys-apps/portage/portage-3.0.56.ebuild

@@ -108,6 +108,7 @@ S="${WORKDIR}"/prefix-${P}
 
 PATCHES=(
 	"${FILESDIR}"/${PN}-3.0.55.1-interrevisions.patch
+	"${FILESDIR}"/${PN}-3.0.49-prefix-stage2.patch
 )
 
 pkg_pretend() {