add first BB script

Author: vchuravy

contrib/.gitignore

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+build/
+products/

contrib/Project.toml

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+[deps]
+BinaryBuilder = "12aac903-9f7c-5d81-afc2-d9565ea332ae"
+BinaryProvider = "b99e7846-7c00-51b0-8f62-c81ae34c0232"

contrib/README.md

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+# Shipping a Julia-compatible Enzyme library
+Since Julia has LLVM as a core dependency and uses a heavily patched version
+we want to ship enzyme build against the same LLVM version in a way that is compatible
+ABI compatible with the LLVM version used by Julia.
+
+## Instructions
+
+```
+julia --project=. build_tarballs.jl --debug x86_64-linux-gnu
+```

contrib/build_tarballs.jl

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+using BinaryBuilder
+
+sources = [
+           "../enzyme"
+          ]
+
+script = raw"""
+cmake -G Ninja -DCMAKE_INSTALL_PREFIX=$prefix -DCMAKE_TOOLCHAIN_FILE=/opt/$target/$target.toolchain \
+      -DLLVM_DIR=/workspace/destdir/lib/cmake/llvm
+ninja install
+"""
+
+products(prefix) = [
+    LibraryProduct(prefix, "LLVMEnzym", :libenzyme),
+]
+
+dependencies = [
+   "https://github.com/staticfloat/LLVMBuilder/releases/download/v6.0.1-7%2Bnowasm/build_LLVM.v6.0.1.jl"
+               ]
+
+# By default, we build for all platforms.
+platforms = supported_platforms()
+
+# Build 'em!
+build_tarballs(
+    ARGS,
+    "enzyme",
+    v"0.0.1",
+    sources,
+    script,
+    platforms,
+    products,
+    dependencies,
+)