remove dl_dep (the check for libdl.so)

Index: src/meson.build
--- src/meson.build.orig
+++ src/meson.build
@@ -61,14 +61,14 @@ scene_sources = files(
 vkmark_core = static_library(
     'vkmark-core',
     core_sources,
-    dependencies : [vulkan_dep, dl_dep, assimp_dep]
+    dependencies : [vulkan_dep, assimp_dep]
     )
 
 vkmark = executable(
     'vkmark',
     files('main.cpp') + vkutil_sources + scene_sources,
     link_with: vkmark_core,
-    dependencies : [vulkan_dep, glm_dep, dl_dep],
+    dependencies : [vulkan_dep, glm_dep],
     link_args: ['-Wl,--dynamic-list=' + join_paths([meson.current_source_dir(), 'dynamic.list'])],
     install : true
     )
