Disabled external gits

cs440-acg/ext/openexr/IlmBase/config.windows/IlmBaseConfig.h

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+// Hand-crafted version of config/IlmBaseConfig.h for Windows
+//
+// Define and set to 1 if the target system has POSIX thread support
+// and you want IlmBase to use it for multithreaded file I/O.
+//
+
+#undef HAVE_PTHREAD
+
+//
+// Define and set to 1 if the target system supports POSIX semaphores
+// and you want OpenEXR to use them; otherwise, OpenEXR will use its
+// own semaphore implementation.
+//
+
+#undef HAVE_POSIX_SEMAPHORES
+
+// Required for system-specific debug trap code in IexBaseExc.cpp
+
+#ifndef PLATFORM_WINDOWS
+#define PLATFORM_WINDOWS 1
+#endif