[GR-8712] Auto-generate wrappers for RFFI functions in testrffi.

...src/com/oracle/truffle/r/ffi/codegen/FFITestsCodeGen.java

...oracle/truffle/r/ffi/impl/common/JavaUpCallsRFFIImpl.java

...c/com/oracle/truffle/r/ffi/impl/upcalls/FastRUpCalls.java

...com/oracle/truffle/r/ffi/impl/upcalls/StdUpCallsRFFI.java

...rc/com/oracle/truffle/r/ffi/impl/upcalls/UpCallsRFFI.java

...racle/truffle/r/ffi/impl/upcalls/VariableUpCallsRFFI.java

...e.truffle.r.native/fficall/src/common/rffi_upcallsindex.h

...ve/fficall/src/truffle_common/Rinternals_truffle_common.h

...racle.truffle.r.native/fficall/src/truffle_common/Rmath.c

com.oracle.truffle.r.native/version.source

...ruffle.r.test.native/packages/testrffi/testrffi/NAMESPACE

...fle.r.test.native/packages/testrffi/testrffi/R/testrffi.R

...uffle.r.test.native/packages/testrffi/testrffi/src/init.c

...test.native/packages/testrffi/testrffi/src/rffiwrappers.c

...test.native/packages/testrffi/testrffi/src/rffiwrappers.h

...e.r.test.native/packages/testrffi/testrffi/src/testrffi.c

mx.fastr/suite.py