hotspot: Use DEFAULT_LIBPATH from build env

[Kurt Miller]

It is convenient to be able to set DEFAULT_LIBPATH
during build time. The other half of this is already
included in src/os/bsd/vm/os_bsd.cpp.

diff -r 36e8a25a0058 make/bsd/makefiles/vm.make
--- a/make/bsd/makefiles/vm.make	Wed Jan 14 11:53:48 2009 -0500
+++ b/make/bsd/makefiles/vm.make	Wed Jan 14 13:35:25 2009 -0500
@@ -86,6 +86,10 @@
   ${JRE_VERSION}     \
   ${VM_DISTRO}
 
+ifdef DEFAULT_LIBPATH
+CPPFLAGS += -DDEFAULT_LIBPATH="\"$(DEFAULT_LIBPATH)\""
+endif
+
 # CFLAGS_WARN holds compiler options to suppress/enable warnings.
 CFLAGS += $(CFLAGS_WARN/BYFILE)