valgrind --trace-children=yes

...at least needed for PythonTest on Linux with internal python, where the
valgrind'ed gb_Python_INSTALLED_EXECUTABLE is /bin/sh
$(gb_DEVINSTALLROOT)/program/python.  Also, remove --quiet again to avoid
frustration ("when valgrind /is/ run, why doesn't it output any "==" lines at
all?").

Change-Id: Id83e53f2b472b5af92e4aaec0c173ecdec45bc48

solenv/gbuild/CppunitTest.mk

@@ -43,7 +43,7 @@ gb_CppunitTest__interactive := $(true)
 endif
 
 ifneq ($(strip $(VALGRIND)),)
-gb_CppunitTest_VALGRINDTOOL := valgrind --tool=$(VALGRIND) --num-callers=50 --error-exitcode=1 --quiet --leak-check=no
+gb_CppunitTest_VALGRINDTOOL := valgrind --tool=$(VALGRIND) --num-callers=50 --error-exitcode=1 --trace-children=yes --leak-check=no
 ifeq ($(strip $(VALGRIND)),memcheck)
 G_SLICE := always-malloc
 GLIBCXX_FORCE_NEW := 1