Remove portage_exec.py as subversion is stupid and can't convert it in one step

svn path=/main/trunk/; revision=5980

diff --git a/pym/portage_exec.py b/pym/portage_exec.py
deleted file mode 120000 (symlink)
index 1149d2f..0000000
--- a/pym/portage_exec.py
+++ /dev/null
@@ -1 +0,0 @@
-portage/process.py
\ No newline at end of file