Fix recursive reference for RELEASE
Fix recursive reference for RELEASE

Building 0.9 with GNU Make 4.0 fails with the following error:

Makefile:4: *** Recursive variable 'RELEASE' references itself (eventually).  Stop.

Change RELEASE to simply-expanded.

Signed-off-by: Linn Crosetto <98cce4645a9a80ad6f708c30f3f87b01a129e343@hpe.com>

rhinstaller/shim,rhinstaller/shim,rhinstaller/shim