DRTVWR-476: Use find_library(dxguid) rather than find_path().

indra/cmake/DirectX.cmake

@@ -11,10 +11,11 @@ if (WINDOWS)
   endif (DIRECTX_INCLUDE_DIR)
 
   # dxhint isn't meant to be the hard-coded DIRECTX_LIBRARY_DIR, we're just
-  # suggesting it as a hint to the next find_path(). The version is embedded
-  # in the DIRECTX_INCLUDE_DIR path string after Include and Lib, which is why
-  # we don't just append a relative path: if there are multiple versions
-  # installed on the host, we need to be sure we're using THE SAME version.
+  # suggesting it as a hint to find_library(). The Windows SDK version number
+  # is embedded in the DIRECTX_INCLUDE_DIR path string after Include and Lib,
+  # which is why we don't just append a relative path: if there are multiple
+  # versions installed on the host, we need to be sure we're using THE SAME
+  # version.
   string(REPLACE "/Include/" "/Lib/" dxhint "${DIRECTX_INCLUDE_DIR}")
   if (ADDRESS_SIZE EQUAL 32)
     set(archdir x86)
@@ -22,7 +23,8 @@ if (WINDOWS)
     set(archdir x64)
   endif()
   string(APPEND dxhint "/${archdir}")
-  find_path(DIRECTX_LIBRARY_DIR dxguid.lib HINTS "${dxhint}")
+  find_library(DXGUID_LIBRARY dxguid HINTS "${dxhint}")
+  get_filename_component(DIRECTX_LIBRARY_DIR "${DXGUID_LIBRARY}" DIRECTORY)
   if (DIRECTX_LIBRARY_DIR)
     if (NOT DIRECTX_FIND_QUIETLY)
       message(STATUS "Found DirectX library: ${DIRECTX_LIBRARY_DIR}")