libtest target alternative to libs

saves me about 20 minutes if I only want to run tests

libsrc/Makefile

@@ -39,6 +39,10 @@ TARGETS = apple2       \
           sym1         \
           telestrat
 
+TARGETTEST = none     \
+             sim6502  \
+             sim65c02
+
 DRVTYPES = emd \
            joy \
            mou \
@@ -53,7 +57,7 @@ OUTPUTDIRS := lib
               $(subst ../,,$(wildcard ../target/*/drv/*))                                     \
               $(subst ../,,$(wildcard ../target/*/util))
 
-.PHONY: all mostlyclean clean install zip lib $(TARGETS)
+.PHONY: all mostlyclean clean install zip lib libtest $(TARGETS)
 
 .SUFFIXES:
 
@@ -81,6 +85,8 @@ datadir = $(PREFIX)/share/cc65
 
 all lib: $(TARGETS)
 
+libtest: $(TARGETTEST)
+
 mostlyclean:
 	$(call RMDIR,../libwrk)