[libdsyscalls.so] This shared object uses libc_arch_static_src_files as a convenient minimal set.
Including them for x86 brings in dl_iterate_phdr_static.c via libc/arch-x86/x86.mk which declares the static-only:
extern void* __executable_start so we don't include them for this one arch.

Signed-off-by: David Greaves <david.greaves@jolla.com>