Isolate PROFILE make variable from incidental setting in the environment

A developer had trouble doing regular "images" builds from a forest with the SE Compact Profiles work present. It turns out that their local shell environment had a value set called PROFILE. This value was used by the makefiles when PROFILE was not explicitly set - which is the case for non-profile images:

images:
        +$(MAKE) -f CreateJars.gmk
        +$(MAKE) -f Images.gmk

Simple fix is to force the make variable to be empty:

images:
        +$(MAKE) PROFILE="" -f CreateJars.gmk
        +$(MAKE) PROFILE="" -f Images.gmk

Workaround is to either unset the env variable before calling make, or pass PROFILE="" as a make argument when building