[EME][GStreamer][OCDM] Detect Rialto OCDM implementation https://bugs.webkit.org/show_bug.cgi?id=312887

Reviewed by Xabier Rodriguez-Calvar.

Rialto OCDM is yet another implementation of the Thunder OCDM interface,
so it should be handled by the CMake scripts in charge of finding the
Thunder libraries.

See: #1650

This patch adds the Rialto OCDM directories to the Thunder path and
library finding CMake helper functions.

Author: Eugene Mutavchi <Ievgen_Mutavchi@comcast.com>

* Source/cmake/FindThunder.cmake: Add the opencdm and ocdmRialto directories.

Canonical link: https://commits.webkit.org/311691@main

Author: emutavchi

Source/cmake/FindThunder.cmake

@@ -52,11 +52,11 @@ find_path(THUNDER_INCLUDE_DIR
     NAMES open_cdm.h
     HINTS ${PC_THUNDER_INCLUDEDIR}
           ${PC_THUNDER_INCLUDE_DIRS}
-    PATH_SUFFIXES "WPEFramework/ocdm/" "Thunder/ocdm/"
+    PATH_SUFFIXES "WPEFramework/ocdm/" "Thunder/ocdm/" "opencdm"
 )
 
 find_library(THUNDER_LIBRARY
-    NAMES ocdm ClientOCDM
+    NAMES ocdm ocdmRialto ClientOCDM
     HINTS ${PC_THUNDER_LIBDIR}
           ${PC_THUNDER_LIBRARY_DIRS}
 )