[GR-6584] Build process refactoring.

.gitignore

ci.hocon

com.oracle.truffle.r.native.recommended/Makefile

com.oracle.truffle.r.native/Makefile

com.oracle.truffle.r.native/fficall/Makefile

com.oracle.truffle.r.native/fficall/src/common/Makefile

...e.truffle.r.native/fficall/src/common/Rinternals_common.c

...racle.truffle.r.native/fficall/src/common/unimplemented.c

com.oracle.truffle.r.native/fficall/src/include/Defn.h

com.oracle.truffle.r.native/fficall/src/truffle_nfi/Memory.c

com.oracle.truffle.r.native/gnur/Makefile.gnur

com.oracle.truffle.r.native/gnur/Makefile.libs

com.oracle.truffle.r.native/gnur/Makefile.platform

com.oracle.truffle.r.native/gnur/patch/Makeconf.in

com.oracle.truffle.r.native/gnur/patch/Makefile.in

com.oracle.truffle.r.native/gnur/patch/SVN-REVISION

com.oracle.truffle.r.native/gnur/patch/VERSION

com.oracle.truffle.r.native/gnur/patch/VERSION-NICK

com.oracle.truffle.r.native/gnur/patch/configure

com.oracle.truffle.r.native/gnur/patch/configure.ac