BUILD: Fix running configure each time "make" is run.

This removes the now generated engines.mk file from the .PHONY rule.
BUILD: Fix typo in Makefile.

It was using engine_plugin_tables.h instead of the proper filename
engine_plugins_table.h.
DEVTOOLS: Adapt create_project for new configure.engine files.

I could not try any generated project files since I do not have access to
the IDEs.
BUILD: Add engine_plugins_table.h to git in the ideprojects target.