Current master does not build on Linux x86_64

[zboszor]

A few changes since #72 were reverted which break using the libpawnc library.

Some more build issues are present at the current tip of main:

amx.c does not build due to inconsistent order of #defines and #includes.

The recently added asm files are not built, so there are undefined references for amx_jit_list, amx_jit_compile and amx_jit_run.