Drop python 3.7 (and 2.7) for recipes under dev-python/

Recipes with only 3.7 are left alone. Help with #8025.

dev-python/dulwich/dulwich-0.20.32.recipe

@@ -8,7 +8,7 @@ LICENSE="
 	Apache v2
 	GNU GPL v2
 	"
-REVISION="1"
+REVISION="2"
 SOURCE_URI="https://pypi.python.org/packages/source/${portName:0:1}/dulwich/dulwich-$portVersion.tar.gz"
 CHECKSUM_SHA256="dc5498b072bdc12c1effef4b6202cd2a4542bb1c6dbb4ddcfc8c6d53e08b488c"
 
@@ -26,8 +26,8 @@ BUILD_REQUIRES="
 	haiku${secondaryArchSuffix}_devel
 	"
 
-PYTHON_PACKAGES=(python3 python38 python39)
-PYTHON_VERSIONS=(3.7 3.8 3.9)
+PYTHON_PACKAGES=(python38 python39)
+PYTHON_VERSIONS=(3.8 3.9)
 for i in "${!PYTHON_PACKAGES[@]}"; do
 pythonPackage=${PYTHON_PACKAGES[i]}
 pythonVersion=${PYTHON_VERSIONS[$i]}
@@ -46,10 +46,10 @@ BUILD_PREREQUIRES="$BUILD_PREREQUIRES
 	cmd:gcc$secondaryArchSuffix"
 done
 
-PROVIDES_python3="$PROVIDES_python3
-	cmd:dul_receive_pack3 = $portVersion
-	cmd:dul_upload_pack3 = $portVersion
-	cmd:dulwich3 = $portVersion
+PROVIDES_python39="$PROVIDES_python39
+	cmd:dul_receive_pack = $portVersion
+	cmd:dul_upload_pack = $portVersion
+	cmd:dulwich = $portVersion
 	"
 
 PROVIDES_python38="$PROVIDES_python38
@@ -58,11 +58,6 @@ PROVIDES_python38="$PROVIDES_python38
 	cmd:dulwich38 = $portVersion
 	"
 
-PROVIDES_python39="$PROVIDES_python39
-	cmd:dul_receive_pack39 = $portVersion
-	cmd:dul_upload_pack39 = $portVersion
-	cmd:dulwich39 = $portVersion
-	"
 
 # TODO add the gpg python module when it's available
 #TEST_REQUIRES=""
@@ -82,21 +77,11 @@ INSTALL()
 		$python setup.py build install \
 			--root=/ --prefix=$prefix
 
-		if [ $pythonPackage == python3 ]; then
-			for f in $prefix/bin/*; do
-				mv $f ${f}3
-			done
-		fi
 		if [ $pythonPackage == python38 ]; then
 			for f in $prefix/bin/*; do
 				mv $f ${f}38
 			done
 		fi
-		if [ $pythonPackage == python39 ]; then
-			for f in $prefix/bin/*; do
-				mv $f ${f}39
-			done
-		fi
 		packageEntries $pythonPackage \
 			$prefix/lib/python* \
 			$prefix/bin