Allow GPU version to compile with OpenMP

[samhatfield]

This PR permits us to build ecTrans for GPUs using OpenMP offload. It is not even remotely working yet. Here I've just done all the work necessary to run a simple test program:

PROGRAM TEST_PROGRAM

USE PARKIND1, ONLY: JPIM

IMPLICIT NONE

INTEGER(JPIM) :: TRUNC

#include "setup_trans0.h"
#include "setup_trans.h"

CALL DR_HOOK_INIT()

CALL SETUP_TRANS0(LDMPOFF=.TRUE., KPRINTLEV=2)

TRUNC = 79

CALL SETUP_TRANS(KSMAX=TRUNC, KDGL=2 * (TRUNC + 1))

END PROGRAM TEST_PROGRAM

I plan to add support for OpenMP offload gradually such that we can eventually run the full benchmark program. This PR is the first step.

I've also taken the opportunity to tidy up SETUP_TRANS.

[samhatfield]

Suggested change

	!$ACC end data
	!$ACC END DATA