fix: Makefile used .c at some places

Author: Zabrimus

Makefile

@@ -88,10 +88,6 @@ all: $(SOFILE) i18n
 
 ### Implicit rules:
 
-%.o: %.c Makefile
-	@echo CC $@
-	$(Q)$(CXX) $(CXXFLAGS) -c $(DEFINES) $(INCLUDES) -o $@ $<
-
 %.o: %.cpp Makefile
 	@echo CC $@
 	$(Q)$(CXX) $(CXXFLAGS) -c $(DEFINES) $(INCLUDES) -o $@ $<
@@ -101,7 +97,7 @@ all: $(SOFILE) i18n
 MAKEDEP = $(CXX) -MM -MG
 DEPFILE = .dependencies
 $(DEPFILE): Makefile
-	$(Q)$(MAKEDEP) $(CXXFLAGS) $(DEFINES) $(INCLUDES) $(OBJS:%.o=%.c) > $@
+	$(Q)$(MAKEDEP) $(CXXFLAGS) $(DEFINES) $(INCLUDES) $(OBJS:%.o=%.cpp) > $@
 
 -include $(DEPFILE)
 
@@ -117,10 +113,6 @@ I18Npot   = $(PODIR)/$(PLUGIN).pot
 	@echo MO $@
 	$(Q)msgfmt -c -o $@ $<
 
-#$(I18Npot): $(wildcard *.c)
-#	@echo GT $@
-#	$(Q)xgettext -C -cTRANSLATORS --no-wrap --no-location -k -ktr -ktrNOOP --package-name=vdr-$(PLUGIN) --package-version=$(VERSION) --msgid-bugs-address='<see README>' -o $@ `ls $^`
-
 $(I18Npot): $(wildcard *.cpp)
 	@echo GT $@
 	$(Q)xgettext -C -cTRANSLATORS --no-wrap --no-location -k -ktr -ktrNOOP --package-name=vdr-$(PLUGIN) --package-version=$(VERSION) --msgid-bugs-address='<see README>' -o $@ `ls $^`
@@ -171,4 +163,4 @@ clean:
 
 .PHONY: cppcheck
 cppcheck:
-	$(Q)cppcheck --language=c++ --enable=all -v -f $(OBJS:%.o=%.c)
+	$(Q)cppcheck --language=c++ --enable=all -v -f $(OBJS:%.o=%.cpp)