Update usdRiPxr CMakeLists to install bundled schemas from renderman …

…itself

Starting with rman26.2 usdRiPxr schemas are bundled with renderman itself,
usdRiPxr installation will need to copy these from the bundled location,
which are published under the known location:
${RENDERMAN_LOCATION}/lib/usd_plugins/usdRiPxr/Resources

(Internal change: 2332562)

third_party/renderman-26/plugin/usdRiPxr/CMakeLists.txt

@@ -1,9 +1,22 @@
 set(PXR_PREFIX pxr/imaging)
 set(PXR_PACKAGE usdRiPxr)
 
-pxr_library(usdRiPxr
-    RESOURCE_FILES
-    plugInfo.json
-    generatedSchema.usda
-    schema.usda:usdRiPxr/schema.usda
-)
+# Conditional logic based on RenderMan version
+if (RENDERMAN_VERSION VERSION_LESS "26.2")
+    pxr_library(usdRiPxr
+        RESOURCE_FILES
+        plugInfo.json
+        generatedSchema.usda
+        schema.usda:usdRiPxr/schema.usda
+    )
+else()
+    # Get the usdRiPxr plugin files from renderman itself
+    # usdRiPxr schemas are known to be installed under the following path:
+    # ${RENDERMAN_LOCATION}/lib/usd_plugins/usdRiPxr/Resources
+    pxr_library(usdRiPxr
+        RESOURCE_FILES
+        ${RENDERMAN_LOCATION}/lib/usd_plugins/usdRiPxr/Resources/plugInfo.json:plugInfo.json
+        ${RENDERMAN_LOCATION}/lib/usd_plugins/usdRiPxr/Resources/generatedSchema.usda:generatedSchema.usda
+        ${RENDERMAN_LOCATION}/lib/usd_plugins/usdRiPxr/Resources/usdRiPxr/schema.usda:usdRiPxr/schema.usda
+    )
+endif()