adding entry point to soft driver, adding C test

test/c/main.c

@@ -0,0 +1,24 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#define VK_NO_PROTOTYPES
+#include <vulkan/vulkan.h>
+
+#include <dlfcn.h>
+
+#ifndef LIBVK
+	#define LIBVK "vulkan"
+#endif
+
+int main(void)
+{
+	printf("openning ./zig-out/lib/lib" LIBVK ".so\n");
+	void* lib = dlopen("./zig-out/lib/lib" LIBVK ".so", RTLD_NOW | RTLD_LOCAL);
+
+	PFN_vkGetInstanceProcAddr vkGetInstanceProcAddr = dlsym(lib, "vk_icdGetInstanceProcAddr");
+
+	printf("test %p\n", vkGetInstanceProcAddr(NULL, "vkCreateInstance"));
+
+	dlclose(lib);
+	return 0;
+}