ci: Disable broken arches in build matrix temporarily

m68k and hexagon can't compile sdxi/enqueue.c. Disable them until this is fixed.

Author: nathanlynch

.github/workflows/check.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        arch: [arm64, m68k, riscv, s390, x86_64]
+        arch: [arm64, riscv, s390, x86_64]
         cc: [clang, gcc]
         include:
           - kunit: --kunit # Run unit tests by default.
@@ -20,19 +20,11 @@ jobs:
             sparse: off # Running sparse with clang is redundant.
           - arch: arm64
             sparse: warn # vgetrandom lacks prototype
-          - arch: m68k
-            sparse: warn
           - arch: riscv
             sparse: off # "invalid argument to '-march' ... " messages
           - arch: s390
             sparse: warn
-          - arch: hexagon # Special case for hexagon.
-            kunit: --no-kunit # No qemu available.
-            sparse: warn
-            cc: clang
         exclude:
-          - arch: m68k
-            cc: clang
           - arch: s390
             cc: clang
     steps: