shadPS4 build: give only shadPS4 the ccache launcher

FEXCore's CMake already wraps its compiles in ccache when it is installed,
so the global CMAKE_<LANG>_COMPILER_LAUNCHER doubled it into
"ccache sloppiness=time_macros ccache clang" and every compile failed.
Pass the launcher to shadPS4's configure alone (patches/0005).

tools/shadps4/build-in-debian.sh

@@ -53,11 +53,11 @@ done
 # only through it, and without it builds ALSA alone.
 export PKG_CONFIG_LIBDIR=/usr/lib/aarch64-linux-gnu/pkgconfig:/usr/share/pkgconfig
 pkg-config --modversion libpulse
-# Every CMake project the build configures (FEXCore, shadPS4 and its externals) compiles through
-# ccache; the cache lives in the workspace (.ccache) and the workflow keeps it between runs.
+# FEXCore compiles through ccache on its own once it is installed, and patches/0005 hands
+# shadPS4's configure the same launcher; the cache lives in the workspace (.ccache) and the
+# workflow keeps it between runs.
 export CCACHE_DIR=$WORK/.ccache CCACHE_BASEDIR=$WORK CCACHE_NOHASHDIR=1 \
-  CCACHE_COMPILERCHECK=content CCACHE_MAXSIZE=4G \
-  CMAKE_C_COMPILER_LAUNCHER=ccache CMAKE_CXX_COMPILER_LAUNCHER=ccache
+  CCACHE_COMPILERCHECK=content CCACHE_MAXSIZE=4G
 ccache -z
 bash "$SRC/runtime/scripts/build-shadps4-arm64.sh"
 ccache -s

tools/shadps4/patches/0005-ccache-for-shadps4.patch

@@ -0,0 +1,13 @@
+diff --git a/runtime/scripts/build-shadps4-arm64.sh b/runtime/scripts/build-shadps4-arm64.sh
+index 49c35fa..2bdcba0 100644
+--- a/runtime/scripts/build-shadps4-arm64.sh
++++ b/runtime/scripts/build-shadps4-arm64.sh
+@@ -74,6 +74,8 @@ cmake -S "$project_root" -B "$build_dir" -G Ninja \
+   -DXEXT_LIB:FILEPATH="$arm64_xext_lib" \
+   -DIMGUI_FONT_EMBED_EXECUTABLE="$host_font_embed" \
+   -DCMAKE_BUILD_TYPE=Release \
++  -DCMAKE_C_COMPILER_LAUNCHER=ccache \
++  -DCMAKE_CXX_COMPILER_LAUNCHER=ccache \
+   -DCMAKE_CXX_SCAN_FOR_MODULES=OFF \
+   -DCMAKE_AR="$llvm_ar" \
+   -DCMAKE_RANLIB="$llvm_ranlib" \