GCC before 14 does not pass --fdpic to the assembler when it compiles
with -mfdpic. The assembler then rejects every FDPIC relocation with
"Relocation supported only in FDPIC mode". The NuttX CI image has GCC
13.2, so the crt0.o of an FDPIC configuration does not build there.
Pass -Wa,--fdpic with -mfdpic, in the make build and the CMake build. A
newer GCC passes the same option itself.
Assisted-by: Claude Code:claude-opus-5-5
Signed-off-by: Marco Casaroli <marco.casaroli@gmail.com>
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