zink: fix core support on Android

- use legacy EGL driver interface
- use Android Vulkan loader
- avoid unrelated kopper source files

v2: update false #elif to #else

Signed-off-by: Yiwei Zhang <zzyiwei@chromium.org>
Reviewed-By: Mike Blumenkrantz <michael.blumenkrantz@gmail.com> (v1)
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18453>

src/gallium/drivers/zink/zink_screen.c

@@ -56,6 +56,8 @@
 #include <unistd.h>
 #if DETECT_OS_APPLE
 #define VK_LIBNAME "libvulkan.1.dylib"
+#elif DETECT_OS_ANDROID
+#define VK_LIBNAME "libvulkan.so"
 #else
 #define VK_LIBNAME "libvulkan.so.1"
 #endif

src/gallium/frontends/dri/meson.build

@@ -44,7 +44,7 @@ if with_dri2
 endif
 
 libdri_c_args = []
-if with_gallium_zink
+if with_gallium_zink and not with_platform_android
   if get_option('glvnd')
     libdri_c_args += '-DKOPPER_LIB_NAMES="libEGL_@0@ and libGLX_@0@"'.format(get_option('glvnd-vendor-name'))
   else

src/gallium/targets/dri/target.c

@@ -125,13 +125,16 @@ DEFINE_LOADER_DRM_ENTRYPOINT(lima)
 #endif
 
 #if defined(GALLIUM_ZINK) && !defined(__APPLE__)
+#if defined(ANDROID)
+DEFINE_LOADER_DRM_ENTRYPOINT(zink);
+#else
 const __DRIextension **__driDriverGetExtensions_zink(void);
 
 PUBLIC const __DRIextension **__driDriverGetExtensions_zink(void)
 {
    return galliumvk_driver_extensions;
 }
-
+#endif
 #endif
 
 #if defined(GALLIUM_D3D12)