nvptx: fix -Wformat-diag warnings

nvptx: fix -Wformat-diag warnings

gcc/ChangeLog:

	* config/nvptx/nvptx.cc (nvptx_goacc_validate_dims_1): Wrap
	keyword.
	* config/nvptx/nvptx.md: Remove trailing dot.

libgomp/ChangeLog:

	* testsuite/libgomp.oacc-c++/privatized-ref-2.C: Update keyword
	in dg-warning.
	* testsuite/libgomp.oacc-c++/privatized-ref-3.C: Likewise.
	* testsuite/libgomp.oacc-c-c++-common/acc_prof-kernels-1.c: Likewise.
	* testsuite/libgomp.oacc-c-c++-common/kernels-loop-2.c: Likewise.
	* testsuite/libgomp.oacc-c-c++-common/parallel-dims.c: Likewise.
	* testsuite/libgomp.oacc-c-c++-common/pr85486.c: Likewise.
	* testsuite/libgomp.oacc-c-c++-common/pr95270-1.c: Likewise.
	* testsuite/libgomp.oacc-c-c++-common/routine-nohost-2.c: Likewise.
	* testsuite/libgomp.oacc-c-c++-common/struct-copyout-1.c: Likewise.
	* testsuite/libgomp.oacc-c-c++-common/struct-copyout-2.c: Likewise.
	* testsuite/libgomp.oacc-c-c++-common/vector-length-64-1.c: Likewise.
	* testsuite/libgomp.oacc-fortran/attach-descriptor-1.f90: Likewise.
	* testsuite/libgomp.oacc-fortran/derivedtypes-arrays-1.f90: Likewise.
	* testsuite/libgomp.oacc-fortran/kernels-loop-2.f95: Likewise.
	* testsuite/libgomp.oacc-fortran/parallel-dims.f90: Likewise.
	* testsuite/libgomp.oacc-fortran/privatized-ref-1.f95: Likewise.