do not clean nqp_launcher

it is created by Configure.pl, so a simple "make" does not rebuild it.
Needs a better solution in the long term

Author: moritz

tools/build/Makefile-Parrot.in

@@ -426,7 +426,6 @@ P_CLEANUPS = \
   nqp_group.h \
   $(P_RUNNER)$(BAT) \
   $(PARROT_BUILD_DIR)/$(P_RUNNER)$(BAT) \
-  $(PARROT_BUILD_DIR)/nqp_launcher \
   $(REGEX_PBC) \
   $(HLL_PBC) \
   $(NQP_MO_PBC) \