linux-samsung-m20lte: Don't override CROSS_COMPILE

Setting this to an empty string will result in the kernel invoking just
"ld" for linking, rather than aarch64-alpine-linux-musl-ld. When
building with GCC and linking with BFD, we still need to rely on
pmbootstrap to set CROSS_COMPILE appropriately, overriding it will break
cross compilation.

Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/8622>

device/downstream/linux-samsung-m20lte/APKBUILD

@@ -4,7 +4,7 @@
 maintainer="Diego Stocco <diegostocco.2008@gmail.com>"
 pkgname=linux-samsung-m20lte
 pkgver=4.4.177
-pkgrel=0
+pkgrel=1
 _commit="339a04eabab9310ad9f6039831f6834d7f9d3c2b"
 pkgdesc="Samsung Galaxy M20 kernel fork"
 arch="aarch64"
@@ -27,6 +27,7 @@ _config="config-$_flavor.$arch"
 source="
 	$pkgname-$_commit.tar.gz::https://github.com/LineageOS/android_kernel_samsung_universal7904/archive/$_commit.tar.gz
 	$_config
+	cross-compile.patch
 	fix-check-lxdialog.patch
 	fix-scsc-kconfig.patch
 	fix-decon.patch
@@ -45,7 +46,7 @@ prepare() {
 
 build() {
 	unset LDFLAGS
-	make O="$_outdir" ARCH="$_carch" CROSS_COMPILE= CC="${CC:-gcc}" \
+	make O="$_outdir" ARCH="$_carch" CC="${CC:-gcc}" \
 		KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-postmarketOS"
 
 	# deviceinfo_bootimg_qcdt
@@ -75,6 +76,7 @@ package() {
 sha512sums="
 663f7cff6dee546104a34f38ba27f89211ef40514e4ebdf63d4bc60a523f31d831e349060b70cc407498a33044ced3d0e806b8325c07f7b5a3b829d610bef490  linux-samsung-m20lte-339a04eabab9310ad9f6039831f6834d7f9d3c2b.tar.gz
 93c5aa1ad25a32a11aaba114ad16dc4a31595b8466594c3c76ae362db590a8b0c0f5d0a160b242fe5275052e9e9b26fa1367959441065e7127c325a5dc19367a  config-samsung-m20lte.aarch64
+4bff19e4711dc5363520ae2d5f165e82d9588d51858a3f1ea48f77fde5a1674ee23bbed8a270a11ec48c0877d27cc28a393ba58ba87f8f2c97fd6abe8495efc3  cross-compile.patch
 182be3c596b9cc267ac108d7cf03fc8c328ccc6b36770800e4dcedea8d1bb65e3f5eacf590c2948f58b1418cc60a1670ba77dde8c259e428d158c31b6e1dbaf5  fix-check-lxdialog.patch
 2038a0e7b3a076e83e4a8fa2e5d35650c52f947985ca58310aaf94211756eef1635bb3c8e047a77ecc0a69de55f49be37081bfd570e49031b2397a9d6de87285  fix-scsc-kconfig.patch
 88a5ef18d9eb31e6d80317925907651229529cd41f8b181b61c14ff56b340341c8ff5c95ab0dd9562b9575d4e206623e7dc039a9eb6b34c455165878df63cd86  fix-decon.patch

device/downstream/linux-samsung-m20lte/cross-compile.patch

@@ -0,0 +1,24 @@
+From 38c0b96c7b8b636f245faac5bfae7859a2e0a81d Mon Sep 17 00:00:00 2001
+From: Aelin <aelin@postmarketos.org>
+Date: Sun, 24 May 2026 03:00:52 +0200
+Subject: [PATCH] Don't use bundled cross toolchain
+
+---
+ Makefile | 1 -
+ 1 file changed, 1 deletion(-)
+
+diff --git a/Makefile b/Makefile
+index 735496c9..0880e9d5 100755
+--- a/Makefile
++++ b/Makefile
+@@ -255,7 +255,6 @@ SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
+ # Default value for CROSS_COMPILE is not to prefix executables
+ # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
+ ARCH            ?= arm64
+-CROSS_COMPILE	?= $(srctree)/toolchain/gcc/linux-x86/aarch64/aarch64-linux-android-4.9/bin/aarch64-linux-android-
+ # Architecture as present in compile.h
+ UTS_MACHINE 	:= $(ARCH)
+ SRCARCH 	:= $(ARCH)
+-- 
+2.54.0
+