Python doesn't quite support the flow of "let me grab a profile from this build
now; I plan to use it later."

In order to *get* the profile, we just need to remove the last profile-removal
step.

Note that we have a special string here that's grep'ed for by the PGO generation
script -- python's PGO profile generation goes something like "run all of the
tests, and collect the profile that results." A small number of the tests break
the sandbox, so the sandbox will fail out our `ebuild` commands regardless of
what we do. In order to work around that, we have the "Full build with [...]"
string below, which functions as the "we did the thing correctly" marker. :)

--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -476,7 +476,7 @@ profile-opt:
 	@echo "Rebuilding with profile guided optimizations:"
 	$(MAKE) clean
 	$(MAKE) build_all_use_profile
-	$(MAKE) profile-removal
+	echo "Full build with profile completed successfully."
 
 build_all_generate_profile:
 	$(MAKE) @DEF_MAKE_RULE@ CFLAGS_NODIST="$(CFLAGS_NODIST) $(PGO_PROF_GEN_FLAG)" LDFLAGS_NODIST="$(LDFLAGS_NODIST) $(PGO_PROF_GEN_FLAG)" LIBS="$(LIBS)"