include/pyconfig.h: Add guard for x86 specific macros

include/pyconfig.h: Add guard for x86 specific macros

HAVE_GCC_ASM_FOR_X64 and HAVE_GCC_ASM_FOR_X87 macros break the build
for app-python3 on AArch64. Therefore, this commit adds an architecture
specific guard for each one of them, as on x86 they behave just fine.

Github-Fixes: #10

Signed-off-by: Maria Sfiraiala <maria.sfiraiala@gmail.com>
Reviewed-by: Razvan Deaconescu <razvand@unikraft.io>
Approved-by: Razvan Deaconescu <razvand@unikraft.io>
Tested-by: Unikraft CI <monkey@unikraft.io>
GitHub-Closes: #11