Exclude super long running tests from the PROFILE_TASK for PGO

builds.  multiprocessing and subprocess tests in particular
along with test_asyncore and test_gdb.  Running them does not
meaningfully add to the profile guidance.

Makefile.pre.in

@@ -230,8 +230,10 @@ HOST_GNU_TYPE=	@host@
 TCLTK_INCLUDES=	@TCLTK_INCLUDES@
 TCLTK_LIBS=	@TCLTK_LIBS@
 
-# The task to run while instrument when building the profile-opt target
-PROFILE_TASK=-m test.regrtest --pgo
+# The task to run while instrumented when building the profile-opt target.
+# We exclude unittests with -x that take a rediculious amount of time to
+# run in the instrumented training build or do not provide much value.
+PROFILE_TASK=-m test.regrtest --pgo -x test_asyncore test_gdb test_multiprocessing_fork test_multiprocessing_forkserver test_multiprocessing_main_handling test_multiprocessing_spawn test_subprocess
 
 # report files for gcov / lcov coverage report
 COVERAGE_INFO=	$(abs_builddir)/coverage.info