ci: Ensure ccache, LTO cache dirs always exist before use

.github/workflows/build-linux.yml

@@ -48,6 +48,7 @@ jobs:
             -Db_thinlto_cache=true
             -Db_thinlto_cache_dir="$LTO_CACHE_DIR"
           )
+          mkdir -p ${LTO_CACHE_DIR}
         fi
         echo "XEMU_BUILD_OPTIONS=${opts[*]}" >> "$GITHUB_ENV"
     - name: Initialize compiler cache
@@ -93,6 +94,7 @@ jobs:
     - name: Setup ccache
       run: |
         echo "PATH=/usr/lib/ccache:$PATH" >> "$GITHUB_ENV"
+        mkdir -p ${CCACHE_DIR}
         ccache -z
     - name: Compile
       run: |

.github/workflows/build-macos.yml

@@ -52,6 +52,7 @@ jobs:
     - name: Setup ccache
       run: |
         echo "PATH=/opt/homebrew/opt/ccache/libexec:$PATH" >> "$GITHUB_ENV"
+        mkdir -p ${CCACHE_DIR}
         ccache -z
     - name: Setup build options
       run: |
@@ -66,6 +67,7 @@ jobs:
             -Db_thinlto_cache=true
             -Db_thinlto_cache_dir="$LTO_CACHE_DIR"
           )
+          mkdir -p ${LTO_CACHE_DIR}
         fi
         echo "XEMU_BUILD_OPTIONS=${opts[*]}" >> "$GITHUB_ENV"
     - name: Compile

.github/workflows/build-windows.yml

@@ -42,7 +42,9 @@ jobs:
         key: cache-wincross-${{ runner.os }}-${{ matrix.arch }}-${{ matrix.configuration }}-${{ github.sha }}
         restore-keys: cache-wincross-${{ runner.os }}-${{ matrix.arch }}-${{ matrix.configuration }}-
     - name: Setup ccache
-      run: ccache -z
+      run: |
+        mkdir -p ${CCACHE_DIR}
+        ccache -z
     - name: Setup build options
       run: |
         if [[ "${{ matrix.configuration }}" == "debug" ]]; then
@@ -54,6 +56,7 @@ jobs:
             --extra-cflags="-flto-incremental=${LTO_CACHE_DIR} -flto-partition=cache"
             -Db_lto=true
           )
+          mkdir -p ${LTO_CACHE_DIR}
         elif [[ "${{ matrix.arch }}" == "arm64" ]]; then
           # FIXME: llvm-mingw ThinLTO has an issue with `qemu_build_not_reached_always`
           #        being intentionaly undefined (to ensure 'unreachable' paths are