libcamera, libqmi, modemmanager: build for the cores the phone has

Same string as the kernel commit, for the three compiled aports this image
builds itself: -march=armv8.6-a+fp16fml+aes+sha3+sm4 -mtune=cortex-a720
appended to CFLAGS (and CXXFLAGS for libcamera). abuild builds these with
Alpine's GCC; the string is gcc's own -march=native expansion on the phone
re-based on armv8.6-a, and it assembles on GCC 15 with binutils 2.45.1 and
on GCC 16 (whose -mcpu=cortex-a720 expansion binutils 2.45 rejects). On the
phone itself gcc -flto, g++ and clang all compile, link and run it.

The base stops at 8.6 on purpose: this phone exposes neither SVE nor MTE
(userspace autovectorised for SVE2 would SIGILL), and not WFxT either.

pkgrel bumps so apk upgrade delivers the rebuilt binaries.

aports/temp/libcamera/APKBUILD

@@ -84,12 +84,13 @@ builddir="$srcdir/$pkgname-v$_pkgver"
 # manual strip because ipa .sign files depend on the file contents- have to re-sign after strip
 options="!strip !check"
 # fp6-img: this package only ever runs on the FP6 (4x Cortex-A520 + 4x
-# Cortex-A720), so tune for it. Spelled -march/-mtune, not -mcpu: GCC 16
-# expands -mcpu=cortex-a720 into a +sve-bitperm token that binutils 2.45
-# rejects at the assembler. +nosve+nomemtag: the FP6 exposes neither SVE nor
-# MTE (no sve/mte hwcaps), and without them the code would SIGILL.
-export CFLAGS="$CFLAGS -march=armv9.2-a+nosve+nomemtag -mtune=cortex-a720"
-export CXXFLAGS="$CXXFLAGS -march=armv9.2-a+nosve+nomemtag -mtune=cortex-a720"
+# Cortex-A720), so build for it. armv8.6-a is the highest level whose
+# mandatory set the phone exposes (8.7 would assume WFxT, 9.x SVE2; neither
+# is in its hwcaps); +fp16fml+aes+sha3+sm4 are the optional extensions it
+# has, the same set `gcc -march=native` derives on the phone. One spelling
+# for gcc and clang, and the same string the kernel aport uses.
+export CFLAGS="$CFLAGS -march=armv8.6-a+fp16fml+aes+sha3+sm4 -mtune=cortex-a720"
+export CXXFLAGS="$CXXFLAGS -march=armv8.6-a+fp16fml+aes+sha3+sm4 -mtune=cortex-a720"
 
 case "$CARCH" in
 arm*|aarch64)

aports/temp/libqmi/APKBUILD

@@ -28,11 +28,12 @@ makedepends="
 # failure), same as modemmanager; build under plain qemu.
 options="!pmb:crossdirect"
 # fp6-img: this package only ever runs on the FP6 (4x Cortex-A520 + 4x
-# Cortex-A720), so tune for it. Spelled -march/-mtune, not -mcpu: GCC 16
-# expands -mcpu=cortex-a720 into a +sve-bitperm token that binutils 2.45
-# rejects at the assembler. +nosve+nomemtag: the FP6 exposes neither SVE nor
-# MTE (no sve/mte hwcaps), and without them the code would SIGILL.
-export CFLAGS="$CFLAGS -march=armv9.2-a+nosve+nomemtag -mtune=cortex-a720"
+# Cortex-A720), so build for it. armv8.6-a is the highest level whose
+# mandatory set the phone exposes (8.7 would assume WFxT, 9.x SVE2; neither
+# is in its hwcaps); +fp16fml+aes+sha3+sm4 are the optional extensions it
+# has, the same set `gcc -march=native` derives on the phone. One spelling
+# for gcc and clang, and the same string the kernel aport uses.
+export CFLAGS="$CFLAGS -march=armv8.6-a+fp16fml+aes+sha3+sm4 -mtune=cortex-a720"
 subpackages="
 	$pkgname-dev
 	$pkgname-doc

aports/temp/modemmanager/APKBUILD

@@ -43,11 +43,12 @@ checkdepends="glib-dev py3-gobject3 py3-dbus"
 # on-device validation is the real test.
 options="!pmb:crossdirect !check"
 # fp6-img: this package only ever runs on the FP6 (4x Cortex-A520 + 4x
-# Cortex-A720), so tune for it. Spelled -march/-mtune, not -mcpu: GCC 16
-# expands -mcpu=cortex-a720 into a +sve-bitperm token that binutils 2.45
-# rejects at the assembler. +nosve+nomemtag: the FP6 exposes neither SVE nor
-# MTE (no sve/mte hwcaps), and without them the code would SIGILL.
-export CFLAGS="$CFLAGS -march=armv9.2-a+nosve+nomemtag -mtune=cortex-a720"
+# Cortex-A720), so build for it. armv8.6-a is the highest level whose
+# mandatory set the phone exposes (8.7 would assume WFxT, 9.x SVE2; neither
+# is in its hwcaps); +fp16fml+aes+sha3+sm4 are the optional extensions it
+# has, the same set `gcc -march=native` derives on the phone. One spelling
+# for gcc and clang, and the same string the kernel aport uses.
+export CFLAGS="$CFLAGS -march=armv8.6-a+fp16fml+aes+sha3+sm4 -mtune=cortex-a720"
 subpackages="
 	$pkgname-lang
 	$pkgname-doc