ovmerge: Switch to the Python implementation

Delete the Perl implementation and install the new Python version, as
used by the Python overlaycheck.

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

Author: pelwell

ovmerge/CMakeLists.txt

@@ -6,4 +6,4 @@ include(GNUInstallDirs)
 project(ovmerge)
 
 #add executables
-install(PROGRAMS ovmerge DESTINATION ${CMAKE_INSTALL_BINDIR})
+install(PROGRAMS ovmerge ovmerge_engine.py DESTINATION ${CMAKE_INSTALL_BINDIR})