Remove provisional OpenCL 2.1 C++ spec to avoid confusion
diff --git a/specs/opencl-2.1-openclc++.pdf b/specs/opencl-2.1-openclc++.pdf
deleted file mode 100644
index 6760e0c..0000000
--- a/specs/opencl-2.1-openclc++.pdf
+++ /dev/null
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