Build fails on musl

[ghost]

Hi, currently obs-vkcapture fails to build on musl with: /src/elfhacks.c:363:39: error: '__ELF_NATIVE_CLASS' undeclared (first use in this function) A patch, more or less stolen from this PR for MangoHud, that seems to work is:

--- a/src/elfhacks.c
+++ b/src/elfhacks.c
@@ -18,6 +18,11 @@
 #include <fnmatch.h>
 #include "elfhacks.h"

+#ifndef __ELF_NATIVE_CLASS
+#include "sys/reg.h"
+#define __ELF_NATIVE_CLASS __WORDSIZE
+#endif
+
 /**
  *  \addtogroup elfhacks
  *  \{

This allows obs-vkcapture to build, however, there are still other runtime issues related to libdl.so, which causes obs-vkcapture to fail. Here is a potentially releveant issue

[nowrep]

Can you please open PR with this? It's fine if the GL capture doesn't work with musl, as long as it can be compiled with musl and Vulkan capture works.

[nowrep]

What are the other issues? The code should correctly handle dlsym not being in libdl.so (it's the case for newer glibc too).