meson: Add wrap for libelf on Windows

Uses release from Lag Free Games GitHub, which applies Windows build
fixes to FreeBSD libelf.

The amd_common library uses libelf.

Reviewed-by: Jesse Natalie <[email protected]>
Acked-by: Samuel Pitoiset <[email protected]>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10202>

Author: James Park

meson.build

@@ -1686,7 +1686,11 @@ with_opencl_native = _opencl != 'disabled' and get_option('opencl-native')
 if (with_amd_vk or with_gallium_radeonsi or
     (with_gallium_opencl and with_opencl_native) or
     (with_gallium_r600 and with_llvm))
-  dep_elf = dependency('libelf', required : false)
+  if with_platform_windows
+    dep_elf = dependency('libelf', required : false, fallback : ['libelf', 'libelf_dep'])
+  else
+    dep_elf = dependency('libelf', required : false)
+  endif
   if not dep_elf.found()
     dep_elf = cc.find_library('elf')
   endif

subprojects/libelf.wrap

@@ -0,0 +1,6 @@
+[wrap-git]
+directory = libelf-lfg-win32-1.0.0-freebsd-12.1.0
+
+url = https://github.com/LagFreeGames/libelf-lfg-win32.git
+revision = 1.0.0
+depth = 1