don't use sed's -i option to stay posix compliant

POSIX does not define sed's -i option. To stay as portable
as possible we should not relay on it.

src/Makefile.include

@@ -40,18 +40,18 @@ $(LIBBITCOINQT):
 ui_%.h: %.ui
 	@test -d $(abs_builddir)/$(@D) || $(MKDIR_P) $(abs_builddir)/$(@D)
 	@test -f $(UIC) && QT_SELECT=$(QT_SELECT) $(UIC) -o $(abs_builddir)/$@ $(abs_srcdir)/$< || echo error: could not build $(abs_builddir)/$@
-	$(SED) -i.bak -e '/^\*\*.*Created:/d' $(abs_builddir)/$@ && rm $(abs_builddir)/$@.bak
-	$(SED) -i.bak -e '/^\*\*.*by:/d' $(abs_builddir)/$@ && rm $(abs_builddir)/$@.bak
+	$(SED) -e '/^\*\*.*Created:/d' $(abs_builddir)/$@ > $(abs_builddir)/$@.n && mv $(abs_builddir)/$@{.n,}
+	$(SED) -e '/^\*\*.*by:/d' $(abs_builddir)/$@ > $(abs_builddir)/$@.n && mv $(abs_builddir)/$@{.n,}
 
 %.moc: %.cpp
 	QT_SELECT=$(QT_SELECT) $(MOC) $(QT_INCLUDES) $(MOC_DEFS) -o $@ $<
-	$(SED) -i.bak -e '/^\*\*.*Created:/d' $@ && rm $@.bak
-	$(SED) -i.bak -e '/^\*\*.*by:/d' $@ && rm $@.bak
+	$(SED) -e '/^\*\*.*Created:/d' $@ > $@.n && mv $@{.n,}
+	$(SED) -e '/^\*\*.*by:/d' $@ > $@.n && mv $@{.n,}
 
 moc_%.cpp: %.h
 	QT_SELECT=$(QT_SELECT) $(MOC) $(QT_INCLUDES) $(MOC_DEFS) -o $@ $<
-	$(SED) -i.bak -e '/^\*\*.*Created:/d' $@ && rm $@.bak
-	$(SED) -i.bak -e '/^\*\*.*by:/d' $@ && rm $@.bak
+	$(SED) -e '/^\*\*.*Created:/d' $@ > $@.n && mv $@{.n,}
+	$(SED) -e '/^\*\*.*by:/d' $@ > $@.n && mv $@{.n,}
 
 %.qm: %.ts
 	@test -d $(abs_builddir)/$(@D) || $(MKDIR_P) $(abs_builddir)/$(@D)

src/qt/Makefile.am

@@ -372,7 +372,7 @@ translate: bitcoinstrings.cpp $(QT_FORMS_UI) $(QT_FORMS_UI) $(BITCOIN_QT_CPP) $(
 $(QT_QRC_CPP): $(QT_QRC) $(QT_QM) $(QT_FORMS_H) $(RES_ICONS) $(RES_IMAGES) $(RES_MOVIES) $(PROTOBUF_H)
 	@cd $(abs_srcdir); test -f $(RCC) && QT_SELECT=$(QT_SELECT) $(RCC) -name bitcoin -o $(abs_builddir)/$@ $< || \
 	  echo error: could not build $@
-	$(SED) -i.bak -e '/^\*\*.*Created:/d' $@ && rm $@.bak
-	$(SED) -i.bak -e '/^\*\*.*by:/d' $@ && rm $@.bak
+	$(SED) -e '/^\*\*.*Created:/d' $@ > $@.n && mv $@{.n,}
+	$(SED) -e '/^\*\*.*by:/d' $@  > $@.n && mv $@{.n,}
 
 CLEANFILES = $(BUILT_SOURCES) $(QT_QM) $(QT_FORMS_H) *.gcda *.gcno