_BOOTDIR1 on MS Windows platform

[Anthony Petrov]

Hello,

Back in 2007 we already discussed this issue with Kelly, but 
transitioning to Mercurial just stopped the work. So, I would like to 
revive this now.

Here's a part of the output generated by `grep -r BOOTDIR make/*`:

> make/common/shared/Defs-solaris.gmk:  _BOOTDIR1  =$(SLASH_JAVA)/re/jdk/$(PREVIOUS_JDK_VERSION)/archive/fcs/binaries/$(PLATFORM)-$(ARCH)
> make/common/shared/Defs-solaris.gmk:  _BOOTDIR2  =$(USRJDKINSTANCES_PATH)/jdk$(PREVIOUS_JDK_VERSION)
> make/common/shared/Defs-windows.gmk:  _BOOTDIR1  =$(_system_drive)/jdk$(PREVIOUS_JDK_VERSION)
> make/common/shared/Defs-windows.gmk:  _BOOTDIR2  =$(USRJDKINSTANCES_PATH)/jdk$(PREVIOUS_JDK_VERSION)
> make/common/shared/Defs-linux.gmk:  _BOOTDIR1  =$(SLASH_JAVA)/re/jdk/$(PREVIOUS_JDK_VERSION)/archive/fcs/binaries/$(PLATFORM)-$(ARCH)
> make/common/shared/Defs-linux.gmk:  _BOOTDIR2  =$(USRJDKINSTANCES_PATH)/jdk$(PREVIOUS_JDK_VERSION)

One can notice that the _BOOTDIR1 is defined differently on MS Windows 
platform. I would like to propose a change so that its value would be 
the same as on other platforms. The SLASH_JAVA on MS Windows equals to 
the J: drive. So one could setup the same directory tree as on 
Linux/Solaris, use the subst command to make the directory the J: drive, 
and be able to build the jdk w/o specifying the ALT_BOOTDIR variable 
manually.

Is there any objection to removing the 
$(_system_drive)/jdk$(PREVIOUS_JDK_VERSION) default path?

--
best regards,
Anthony