obsolete code related to JDK6 in hotspot/make

A bunch of code is related to JDK6 and should be removed. Latest hotspot will not work with JDK6 anyway.

./windows/build.make:# if the build is for JDK6 or earlier version, it should include jdk6_hotspot_distro,
./windows/build.make:JDK6_OR_EARLIER=0
./windows/build.make:JDK6_OR_EARLIER=1
./windows/build.make:JDK6_OR_EARLIER=1
./windows/build.make:!if $(JDK6_OR_EARLIER) == 1
./windows/build.make:!include $(WorkSpace)\make\jdk6_hotspot_distro
./linux/makefiles/defs.make:# determine if HotSpot is being built in JDK6 or earlier version
./linux/makefiles/defs.make:JDK6_OR_EARLIER=0
./linux/makefiles/defs.make: JDK6_OR_EARLIER=1
./linux/makefiles/defs.make: JDK6_OR_EARLIER=1
./linux/makefiles/defs.make:ifeq ($(JDK6_OR_EARLIER),0)
./solaris/makefiles/sparcWorks.make: # Validated compiler for JDK6 is SS11 (5.8)
./solaris/makefiles/defs.make:# determine if HotSpot is being built in JDK6 or earlier version
./solaris/makefiles/defs.make:JDK6_OR_EARLIER=0
./solaris/makefiles/defs.make: JDK6_OR_EARLIER=1
./solaris/makefiles/defs.make: JDK6_OR_EARLIER=1
./solaris/makefiles/defs.make:ifeq ($(JDK6_OR_EARLIER),0)
./bsd/makefiles/defs.make:# determine if HotSpot is being built in JDK6 or earlier version
./bsd/makefiles/defs.make:JDK6_OR_EARLIER=0
./bsd/makefiles/defs.make: JDK6_OR_EARLIER=1
./bsd/makefiles/defs.make: JDK6_OR_EARLIER=1
./bsd/makefiles/defs.make:ifeq ($(JDK6_OR_EARLIER),0)
./aix/makefiles/defs.make:# determine if HotSpot is being built in JDK6 or earlier version
./aix/makefiles/defs.make:JDK6_OR_EARLIER=0
./aix/makefiles/defs.make: JDK6_OR_EARLIER=1
./aix/makefiles/defs.make: JDK6_OR_EARLIER=1
./aix/makefiles/defs.make:ifeq ($(JDK6_OR_EARLIER),0)