tools: Remove packhex

All tools should be removed from the RTEMS source repository at some
point in time.  Tools with a BSD-style license will be moved to the
RTEMS tools repository.  Unfortunately, this tool has no license
information.

Remove all uses of this tool from the code base.  Users of HEX files
should consider to use ELF instead.

Close #3379.

bsps/m68k/mrm332/config/mrm332.cfg

@@ -17,12 +17,3 @@ CFLAGS_OPTIMIZE_V = -Os -g -fomit-frame-pointer
 # The following two lines enable compiling and linking on per element.
 # CFLAGS_OPTIMIZE_V += -ffunction-sections -fdata-sections
 # LDFLAGS = -Wl,--gc-sections
-
-define bsp-post-link
-	$(OBJCOPY) -O srec $(basename $@)$(EXEEXT) $(basename $@).srec
-	sed -e 's/.$$//' -e '/^S0/d' $(basename $@).srec | \
-	    $(PACKHEX) > $(basename $@)$(DOWNEXT)
-	rm -f $(basename $@).srec
-	$(default-bsp-post-link)
-endef
-

bsps/m68k/mvme147/config/mvme147.cfg

@@ -15,11 +15,3 @@ CFLAGS_OPTIMIZE_V = -O2 -g -fomit-frame-pointer
 CFLAGS_OPTIMIZE_V += -ffunction-sections -fdata-sections
 
 LDFLAGS = -Wl,--gc-sections
-
-define bsp-post-link
-	$(OBJCOPY) -O srec $(basename $@)$(EXEEXT) $(basename $@).srec
-	sed -e 's/.$$//' -e '/^S0/d' $(basename $@).srec | \
-	    $(PACKHEX) > $(basename $@)$(DOWNEXT)
-	rm -f $(basename $@).srec
-	$(default-bsp-post-link)
-endef

bsps/m68k/mvme147s/config/mvme147s.cfg

@@ -15,13 +15,3 @@ CFLAGS_OPTIMIZE_V = -O2 -g -fomit-frame-pointer
 CFLAGS_OPTIMIZE_V += -ffunction-sections -fdata-sections
 
 LDFLAGS = -Wl,--gc-sections
-
-define bsp-post-link
-	$(OBJCOPY) -O srec $(basename $@)$(EXEEXT) $(basename $@).srec
-	sed -e 's/.$$//' -e '/^S0/d' $(basename $@).srec | \
-	    $(PACKHEX) > $(basename $@)$(DOWNEXT)
-	rm -f $(basename $@).srec
-	$(default-bsp-post-link)
-endef
-
-# Miscellaneous additions go here