Disable GNUABI for unsupported targets in precommit

Default is on, but this setting was previously just ignored when
unsupported. Disable it in the failing pipelines.

.github/workflows/build_and_test.yml

@@ -17,7 +17,6 @@ env:
   LLVM_VERSION: "17"
   COMMON_CMAKE_FLAGS: >
     -DSLEEF_SHOW_CONFIG=1
-    -DSLEEF_BUILD_GNUABI_LIBS=ON
     -DSLEEF_BUILD_INLINE_HEADERS=ON
     -DSLEEF_BUILD_DFT=ON
     -DSLEEF_BUILD_QUAD=ON
@@ -214,15 +213,15 @@ jobs:
             EXTRA_CMAKE_FLAGS="${EXTRA_CMAKE_FLAGS} -DSLEEF_ENFORCE_SVE=ON"
           elif [[ ${{ matrix.arch }} = "armhf" ]]; then
             # Disable inline headers, they just don't compile on armhf
-            EXTRA_CMAKE_FLAGS="${EXTRA_CMAKE_FLAGS} -DSLEEF_BUILD_INLINE_HEADERS=OFF"
+            EXTRA_CMAKE_FLAGS="${EXTRA_CMAKE_FLAGS} -DSLEEF_BUILD_INLINE_HEADERS=OFF -DSLEEF_BUILD_GNUABI_LIBS=OFF"
           elif [[ ${{ matrix.arch }} = "ppc64el" ]]; then
-            EXTRA_CMAKE_FLAGS="${EXTRA_CMAKE_FLAGS} -DSLEEF_ENFORCE_VSX=ON -DSLEEF_ENFORCE_VSX3=ON"
+            EXTRA_CMAKE_FLAGS="${EXTRA_CMAKE_FLAGS} -DSLEEF_ENFORCE_VSX=ON -DSLEEF_ENFORCE_VSX3=ON -DSLEEF_BUILD_GNUABI_LIBS=OFF"
           elif [[ ${{ matrix.arch }} = "s390x" ]]; then
-            EXTRA_CMAKE_FLAGS="${EXTRA_CMAKE_FLAGS} -DSLEEF_ENFORCE_VXE=ON"
+            EXTRA_CMAKE_FLAGS="${EXTRA_CMAKE_FLAGS} -DSLEEF_ENFORCE_VXE=ON -DSLEEF_BUILD_GNUABI_LIBS=OFF"
             # Disable VXE2 support, QEMU doesn't support some instructions generated by gcc or llvm
             EXTRA_CMAKE_FLAGS="${EXTRA_CMAKE_FLAGS} -DSLEEF_DISABLE_VXE2=ON"
           elif [[ ${{ matrix.arch }} = "riscv64" ]]; then
-            EXTRA_CMAKE_FLAGS="${EXTRA_CMAKE_FLAGS} -DSLEEF_ENFORCE_RVVM1=ON -DSLEEF_ENFORCE_RVVM2=ON"
+            EXTRA_CMAKE_FLAGS="${EXTRA_CMAKE_FLAGS} -DSLEEF_ENFORCE_RVVM1=ON -DSLEEF_ENFORCE_RVVM2=ON -DSLEEF_BUILD_GNUABI_LIBS=OFF"
           fi
 
           cmake -S . -B _build-${{ matrix.arch }} -GNinja \