Use aarch64's INLINE_SYSCALL
Use aarch64's INLINE_SYSCALL

I was getting undefined references to __syscall_error when using the
old one.  aarch64's version doesn't calal into __syscall_error but
instead uses the defined macros to inline the functionality of
__syscall_error, which certainly feels like it's in the spirit of
INLINE_SYSCALL.

manuelafm/riscv-gnu-toolchain,manuelafm/riscv-gnu-toolchain,manuelafm/riscv-gnu-toolchain