CMake: Update for upstream changes

dtool/src/dtoolutil/CMakeLists.txt

@@ -66,6 +66,8 @@ set(P3DTOOLUTIL_IGATEEXT
   filename_ext.h
   globPattern_ext.cxx
   globPattern_ext.h
+  iostream_ext.cxx
+  iostream_ext.h
   textEncoder_ext.cxx
   textEncoder_ext.h
 )

panda/src/pipeline/CMakeLists.txt

@@ -114,8 +114,12 @@ if(WIN32)
 endif()
 
 set(P3PIPELINE_IGATEEXT
+  pmutex_ext.h
+  pmutex_ext.I
   pythonThread.cxx
   pythonThread.h
+  reMutex_ext.h
+  reMutex_ext.I
 )
 
 composite_sources(p3pipeline P3PIPELINE_SOURCES)