gitpython: minor cleanups, drop 3.9 package. (#11335)

Only on-tree user of this package (gertty) is 3.10 only already.

dev-python/gitpython/gitpython-3.1.40.recipe

@@ -3,7 +3,7 @@ DESCRIPTION="Python library used to interact with Git repositories."
 HOMEPAGE="https://pypi.org/project/GitPython/"
 COPYRIGHT="2010-2018 Sebastian Thiel, Michael Trier"
 LICENSE="BSD (3-clause)"
-REVISION="2"
+REVISION="3"
 SOURCE_URI="https://pypi.org/packages/source/G/GitPython/GitPython-$portVersion.tar.gz"
 SOURCE_DIR="GitPython-$portVersion"
 CHECKSUM_SHA256="22b126e9ffb671fdd0c129796343a02bf67bf2994b35449ffc9321aa755e18a4"
@@ -25,11 +25,12 @@ TEST_REQUIRES="
 	cmd:pytest
 	"
 
-PYTHON_PACKAGES=(python39 python310)
-PYTHON_VERSIONS=(3.9 3.10)
-for i in "${!PYTHON_PACKAGES[@]}"; do
-	pythonPackage=${PYTHON_PACKAGES[i]}
+PYTHON_VERSIONS=(3.10)
+
+for i in "${!PYTHON_VERSIONS[@]}"; do
 	pythonVersion=${PYTHON_VERSIONS[$i]}
+	pythonPackage=python${pythonVersion//.}
+
 	eval "PROVIDES_${pythonPackage}=\"
 		${portName}_$pythonPackage = $portVersion
 		\""
@@ -38,29 +39,31 @@ for i in "${!PYTHON_PACKAGES[@]}"; do
 		gitdb_$pythonPackage
 		cmd:python$pythonVersion
 		\""
-	BUILD_REQUIRES="$BUILD_REQUIRES
+	BUILD_REQUIRES+="
 		setuptools_$pythonPackage
 		"
-	BUILD_PREREQUIRES="$BUILD_PREREQUIRES
+	BUILD_PREREQUIRES+="
 		cmd:python$pythonVersion
 		"
 done
 
 INSTALL()
 {
-	for i in "${!PYTHON_PACKAGES[@]}"; do
-		pythonPackage=${PYTHON_PACKAGES[i]}
+	for i in "${!PYTHON_VERSIONS[@]}"; do
 		pythonVersion=${PYTHON_VERSIONS[$i]}
+		pythonPackage=python${pythonVersion//.}
 
 		python=python$pythonVersion
 		installLocation=$prefix/lib/$python/vendor-packages/
 		export PYTHONPATH=$installLocation:$PYTHONPATH
+
 		mkdir -p $installLocation
 		rm -rf build
+
 		$python setup.py build install \
 			--root=/ --prefix=$prefix
 
-		packageEntries  $pythonPackage \
+		packageEntries $pythonPackage \
 			$prefix/lib/python*
 	done
 }