build: more out-of-tree fixups

- clear the __pycache__ during 'make clean'
- Copy the qrc locale file to a temp location and remove it when finished
  (rcc expects everything to be in the same path)

src/Makefile.am

@@ -441,6 +441,7 @@ clean-local:
 	-$(MAKE) -C univalue clean
 	-rm -f leveldb/*/*.gcda leveldb/*/*.gcno leveldb/helpers/memenv/*.gcda leveldb/helpers/memenv/*.gcno
 	-rm -f config.h
+	-rm -rf test/__pycache__
 
 .rc.o:
 	@test -f $(WINDRES)

src/Makefile.qt.include

@@ -400,9 +400,10 @@ translate: qt/bitcoinstrings.cpp $(QT_FORMS_UI) $(QT_FORMS_UI) $(BITCOIN_QT_CPP)
 
 $(QT_QRC_LOCALE_CPP): $(QT_QRC_LOCALE) $(QT_QM)
 	@test -f $(RCC)
-	@test -f $(@D)/$(<F) || cp -f $< $(@D)
-	$(AM_V_GEN) QT_SELECT=$(QT_SELECT) $(RCC) -name bitcoin_locale $(@D)/$(<F) | \
+	@cp -f $< $(@D)/temp_$(<F)
+	$(AM_V_GEN) QT_SELECT=$(QT_SELECT) $(RCC) -name bitcoin_locale $(@D)/temp_$(<F) | \
 	  $(SED) -e '/^\*\*.*Created:/d' -e '/^\*\*.*by:/d' > $@
+	@rm $(@D)/temp_$(<F)
 
 $(QT_QRC_CPP): $(QT_QRC) $(QT_FORMS_H) $(RES_ICONS) $(RES_IMAGES) $(RES_MOVIES) $(PROTOBUF_H)
 	@test -f $(RCC)