python: Add support for installing Python eggs

pkgs/development/interpreters/python/hooks/egg-build-hook.sh

@@ -0,0 +1,15 @@
+# Setup hook to use for eggs
+echo "Sourcing egg-build-hook"
+
+eggBuildPhase() {
+    echo "Executing eggBuildPhase"
+    runHook preBuild
+
+    runHook postBuild
+    echo "Finished executing eggBuildPhase"
+}
+
+if [ -z "${dontUseEggBuild-}" ] && [ -z "${buildPhase-}" ]; then
+    echo "Using eggBuildPhase"
+    buildPhase=eggBuildPhase
+fi