main/gcc{4,6}: disable on ppc64le and loongarch64

Neither ppc64le nor loongarch64 use vendor kernels, so the old GCCs
packages are not required.

They currently don't build either because of a couple of problems when
building with GCC 15. If we really want to, ppc64le can be re-enabled
once those problems are resolved, since it is supported since GCC 4.9.
loongarch64 needs a much newer GCC.

[ci:skip-vercheck]

Signed-off-by: Jens Reidel <adrian@postmarketos.org>
Part-of: https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/7117
[ci:skip-build]: just disabling some arches

main/gcc4/APKBUILD

@@ -4,7 +4,10 @@ _pkgver=4.9.2
 pkgrel=7
 pkgdesc="Old GCC for old vendor kernels (C compiler only)"
 url="http://gcc.gnu.org"
-arch="all !riscv64" # riscv64: doesn't build
+# loongarch64: not relevant
+# ppc64le: not relevant
+# riscv64: doesn't build
+arch="all !loongarch64 !ppc64le !riscv64"
 license="GPL LGPL"
 _gccrel=$_pkgver-r$pkgrel
 depends="binutils mpc1"

main/gcc6/APKBUILD

@@ -4,7 +4,10 @@ _pkgver=6.4.0
 pkgrel=12
 pkgdesc="Old GCC for old vendor kernels (C compiler only)"
 url="http://gcc.gnu.org"
-arch="all !riscv64" # riscv64: doesn't build
+# loongarch64: not relevant
+# ppc64le: not relevant
+# riscv64: doesn't build
+arch="all !loongarch64 !ppc64le !riscv64"
 license="GPL LGPL"
 _gccrel=$_pkgver-r$pkgrel
 depends="binutils mpc1"