Fix slowing down compilation caused by ccache

Use sloppiness mode for ccache to force ccache to ignore code file modification times, preventing ccache to use preprocess hit mode to slow down the compiling process.

Author: cctv18

.github/workflows/fastbuild_6.6.50.yml

@@ -536,6 +536,7 @@ jobs:
           echo "LLD版本: $LLD_VERSION"
           pahole_version=$(pahole --version 2>/dev/null | head -n1); [ -z "$pahole_version" ] && echo "pahole版本：未安装" || echo "pahole版本：$pahole_version"
           
+          export CCACHE_SLOPPINESS="include_file_mtime"
           export CCACHE_COMPILERCHECK="%compiler% -dumpmachine; %compiler% -dumpversion"
           export CCACHE_NOHASHDIR="true"
           export CCACHE_HARDLINK="true"

.github/workflows/fastbuild_6.6.66.yml

@@ -534,6 +534,7 @@ jobs:
           echo "LLD版本: $LLD_VERSION"
           pahole_version=$(pahole --version 2>/dev/null | head -n1); [ -z "$pahole_version" ] && echo "pahole版本：未安装" || echo "pahole版本：$pahole_version"
           
+          export CCACHE_SLOPPINESS="include_file_mtime"
           export CCACHE_COMPILERCHECK="%compiler% -dumpmachine; %compiler% -dumpversion"
           export CCACHE_NOHASHDIR="true"
           export CCACHE_HARDLINK="true"