While working on JDK-7165611, I changed literal 'dsymutil' uses into
$(DSYMUTIL) macro calls and I added configure support for detecting
and defining the DSYMUTIL macro.

While doing this work, I also noticed literal 'lipo' cmd uses in the
HotSpot makefiles. This should be fixed to use a LIPO macro.

I think that configure support for the 'LIPO' macro is already present
but make/bsd/makefiles/gcc.make will need:

+ifeq ($(OS_VENDOR), Darwin)
+ ifeq ($(LIPO),)
+ LIPO=lipo
+ endif
+endif

Since 'lipo' isn't part of the FDS implementation, I left this minor issue
alone while working on JDK-7165611.