File toolset.patch of Package boost

--- boost_1_87_0/bootstrap.sh~	2025-03-26 20:12:49.911274007 +0100
+++ boost_1_87_0/bootstrap.sh	2025-03-26 20:13:32.138975630 +0100
@@ -196,7 +196,7 @@
 
 # Determine the toolset, if not already decided
 if test "x$TOOLSET" = x; then
-  guessed_toolset=`CXX= CXXFLAGS= $my_dir/tools/build/src/engine/build.sh --guess-toolset`
+  guessed_toolset=`$my_dir/tools/build/src/engine/build.sh --cxx="$CXX" --cxxflags="$CXXFLAGS" --guess-toolset`
   case $guessed_toolset in
     acc | clang | gcc | como | mipspro | pathscale | pgi | qcc | vacpp )
     TOOLSET=$guessed_toolset
@@ -226,7 +226,7 @@
 if test "x$BJAM" = x; then
   $ECHO "Building B2 engine.."
   pwd=`pwd`
-  CXX= CXXFLAGS= "$my_dir/tools/build/src/engine/build.sh" ${TOOLSET}
+  "$my_dir/tools/build/src/engine/build.sh" --cxx="$CXX" --cxxflags="$CXXFLAGS" ${TOOLSET}
   if [ $? -ne 0 ]; then
       echo
       echo "Failed to build B2 build engine"