Fix build issue with riscv sample test

[Ryan Long]

When trying to build the minimum sample test for any RISC-V BSP, the following error occurs.

start.o: in function .L0:

/home/tester/rtems-cron-6/rtems/build/riscv/rv32i/../../../bsps/riscv/shared/start/start.S:84:(.bsp_start_text+0x2c): relocation truncated to fit: R_RISCV_GPREL_I against symbol 'bsp_section_bss_size' defined in *ABS* section in /home/tester/rtems-cron-6/rtems/build/riscv/rv32i/testsuites/samples/minimum.exe

collect2: error: ld returned 1 exit status

[Sebastian Huber]

I cannot reproduce this issue on my development machines. It could be an issue in the linker. I would run the linker in GDB and try to debug it to figure out what is going on.

[Sebastian Huber <sebastian.huber@…>]

In 89ba2a98/rtems:

bsps/riscv: Workaround for sporadic linker issues

Disable the linker relaxation in start.S to work around an issue described
here:

​https://mail.gnu.org/archive/html/bug-binutils/2021-03/msg00164.html

The real issue is probably in the linker command file or the linker itself.

Update #4658.

[Sebastian Huber <sebastian.huber@…>]

In b4ffaa7c/rtems:

bsps/riscv: Use start data for object

Maybe this helps to ensure that the object is properly aligned.

Update #4658.