[committed, PR83737] Set use_gcc_stdint=wrap for nvptx

[Tom de Vries]

Hi,

atm, for nvptx we have the following failure:
...
FAIL: gcc.dg/stdint-width-1.c (test for excess errors)
...

In more detail:
...
gcc/testsuite/gcc.dg/stdint-width-1.c:20:4: error: #error "missing 
INT8_WIDTH"
...

The test fails because newlib's stdint.h lacks TS 18661-1 support.

The test deliberately uses -ffreestanding so that any
configurations using GCC's stdint.h for freestanding compilations have 
no problems with system stdint.h lacking TS 18661-1 support. But GCC 
stdint.h is not used for nvptx, because use_gcc_stdint defaults to 
"none" in config.gcc.

The patch fixes the test failure by setting use_gcc_stdint=wrap for 
nvptx, so that GCC's stdint.h includes libc's for hosted compilations 
but GCC's own for freestanding compilations.

Build and reg-tested on nvptx.
Build on x86_64 with nvptx accelerator and tested libgomp.

Committed.

Thanks,
- Tom

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