meson.build: Fix Vulkan library detection on Visual Studio
The Vulkan .lib file that is supplied by the LunarG Vulkan SDK is
vulkan-1.lib, not vulkan.lib, so make sure we look for the right
libraries when building on Visual Studio (I am not sure whether the
LunarG SDK will work for MinGW/mingw-w64 builds, as only Visual Studio
.lib files are provided).
Note that this will require one to set LIB and INCLUDE appropriately to
find the Vulkan .lib and header files, and possibly PATH if one's video
drivers do not contain the Vulkan runtime DLL.
https://bugzilla.gnome.org/show_bug.cgi?id=785210