Fix automake warnings when running autogen.sh

Makefile.am

@@ -9,7 +9,6 @@ SUBDIRS += doc/man
 endif
 .PHONY: deploy FORCE
 
-GZIP_ENV="-9n"
 export PYTHONPATH
 
 if BUILD_BITCOIN_LIBS

src/Makefile.am

@@ -500,10 +500,6 @@ clean-local:
 	## FIXME: How to get the appropriate modulename_CPPFLAGS in here?
 	$(AM_V_GEN) $(WINDRES) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(CPPFLAGS) -DWINDRES_PREPROC -i $< -o $@
 
-.mm.o:
-	$(AM_V_CXX) $(OBJCXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
-	  $(CPPFLAGS) $(AM_CXXFLAGS) $(QT_INCLUDES) $(AM_CXXFLAGS) $(PIE_FLAGS) $(CXXFLAGS) -c -o $@ $<
-
 check-symbols: $(bin_PROGRAMS)
 if GLIBC_BACK_COMPAT
 	@echo "Checking glibc back compat..."