runtime: docker: clang-(20|21|22): Drop loongarch from target_bases

The loongarch target don't need to use base-debianunstable anymore for
clang-20, clang-21 and clang-22, so lets remove it from target_bases.

Signed-off-by: Anders Roxell <anders.roxell@linaro.org>

Author: roxell

tuxmake/runtime/docker.ini

@@ -396,7 +396,7 @@ hosts = amd64, arm64
 targets = x86_64, arm64, i386, arm, armv5, mips, powerpc, riscv, s390, loongarch, sparc
 rebuild = monthly
 packages = clang-20, clang-tidy-20, libclang-rt-20-dev, llvm-20, lld-20,
-target_bases = loongarch:base-debianunstable, sparc:base-debianunstable
+target_bases = sparc:base-debianunstable
 install_options = -t llvm-toolchain-trixie-20
 extra_apt_repo = deb http://apt.llvm.org/trixie llvm-toolchain-trixie-20 main
 extra_apt_repo_key = https://apt.llvm.org/llvm-snapshot.gpg.key
@@ -408,7 +408,7 @@ hosts = amd64, arm64
 targets = x86_64, arm64, i386, arm, armv5, mips, powerpc, riscv, s390, loongarch, sparc
 rebuild = monthly
 packages = clang-21, clang-tidy-21, libclang-rt-21-dev, llvm-21, lld-21,
-target_bases = loongarch:base-debianunstable, sparc:base-debianunstable
+target_bases = sparc:base-debianunstable
 install_options = -t llvm-toolchain-trixie-21
 extra_apt_repo = deb http://apt.llvm.org/trixie llvm-toolchain-trixie-21 main
 extra_apt_repo_key = https://apt.llvm.org/llvm-snapshot.gpg.key
@@ -420,7 +420,7 @@ hosts = amd64, arm64
 targets = x86_64, arm64, i386, arm, armv5, mips, powerpc, riscv, s390, loongarch, sparc
 rebuild = monthly
 packages = clang-22, clang-tidy-22, libclang-rt-22-dev, llvm-22, lld-22,
-target_bases = loongarch:base-debianunstable, sparc:base-debianunstable
+target_bases = sparc:base-debianunstable
 install_options = -t llvm-toolchain-trixie-22
 extra_apt_repo = deb http://apt.llvm.org/trixie llvm-toolchain-trixie-22 main
 extra_apt_repo_key = https://apt.llvm.org/llvm-snapshot.gpg.key