build-python: Update to v3.9.7, remove patches

Also add gitignores/dockerignores for directories created during
the python build.

build-python.sh

@@ -17,11 +17,8 @@
 set -e
 
 : ${LIBFFI_VERSION:=v3.4.2}
-: ${PYTHON_MAJOR:=3}
-: ${PYTHON_MINOR:=9}
-: ${PYTHON_PATCH:=6}
-: ${PYTHON_VERSION:=v${PYTHON_MAJOR}.${PYTHON_MINOR}.${PYTHON_PATCH}}
-: ${PYTHON_VERSION_MINGW:=61c5a4a14932539b31878de0b60bc98bcba791b9}
+: ${PYTHON_VERSION:=v3.9.7}
+: ${PYTHON_VERSION_MINGW:=8736112bab36bc8f0612f33237f64473640ff3b8}
 
 unset HOST
 
@@ -120,9 +117,7 @@ fi
 if [ -n "$SYNC" ] || [ -n "$CHECKOUT_PYTHON" ]; then
     cd cpython-mingw
     [ -z "$SYNC" ] || git fetch
-    git reset --hard
     git checkout $PYTHON_VERSION_MINGW
-    cat ../patches/python/*.patch | patch -Nup1
     autoreconf -vfi
     cd ..
 fi
@@ -144,7 +139,6 @@ mkdir -p $BUILDDIR
 cd $BUILDDIR
 BUILD=$(../config.guess) # Python configure requires build triplet for cross compilation
 
-# Avoid gcc workarounds in distutils
 export CC=$HOST-clang
 export CXX=$HOST-clang++