Makefile.SH - use new --fix option to manisort and simplify

The --fix option returns true if it worked, and so the use of
the true command is not required.

Author: demerphq

Makefile.SH

@@ -667,7 +667,7 @@ all: $(FIRSTMAKEFILE) $(MINIPERL_EXE) $(generated_pods) $(private) $(unidatafile
 
 $(MANIFEST_SRT):	MANIFEST $(PERL_EXE)
 	@$(RUN_PERL) Porting/manisort -q || (echo "WARNING: re-sorting MANIFEST"; \
-	    $(RUN_PERL) Porting/manisort -q -o MANIFEST; sh -c true)
+	    $(RUN_PERL) Porting/manisort --fix=MANIFEST)
 	@touch $(MANIFEST_SRT)
 
 .PHONY: all utilities
@@ -1287,7 +1287,7 @@ regen_all regen-all: regen regen_meta
 
 manisort:	FORCE
 	@perl Porting/manisort -q || (echo "WARNING: re-sorting MANIFEST"; \
-		perl Porting/manisort -q -o MANIFEST; sh -c true)
+		perl Porting/manisort --fix=MANIFEST)
 
 manicheck:	FORCE
 	perl Porting/manicheck