Add cramjam (#1321)

recipes/recipes_emscripten/cramjam/build.sh

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+#!/bin/bash
+
+export MATURIN_PYTHON_SYSCONFIGDATA_DIR=${PREFIX}/etc/conda/_sysconfigdata__emscripten_wasm32-emscripten.py
+${PYTHON} -m pip install . -vv

recipes/recipes_emscripten/cramjam/recipe.yaml

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+context:
+  name: cramjam
+  version: 2.8.3
+
+package:
+  name: ${{ name|lower }}
+  version: ${{ version }}
+
+source:
+  url: https://pypi.io/packages/source/${{ name[0] }}/${{ name }}/${{ name }}-${{ version }}.tar.gz
+  sha256: 6b1fa0a6ea8183831d04572597c182bd6cece62d583a36cde1e6a86e72ce2389
+
+build:
+  number: 0
+
+requirements:
+  build:
+    - python
+    - cross-python_${{ target_platform }}
+    - maturin
+    - toml
+    - rust
+    - ${{ compiler('cxx') }}
+  host:
+    - python
+    - pip
+  run:
+    - python
+
+tests:
+  - script: pytester
+    files:
+      recipe:
+      - test_cramjam.py
+    requirements:
+      build:
+      - pytester
+      run:
+      - pytester-run
+
+about:
+  homepage: https://github.com/milesgranger/cramjam
+  license: MIT
+  license_family: MIT
+  license_file: LICENSE
+  summary: python bindings to rust-implemented compression
+  description: |
+    Extremely thin Python bindings to de/compression algorithms in Rust. 
+  documentation: https://docs.rs/cramjam
+
+extra:
+  recipe-maintainers:
+    - milesgranger

recipes/recipes_emscripten/cramjam/test_cramjam.py

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+def test_cramjam():
+    import cramjam
+
+    compressed = cramjam.snappy.compress(b"bytes")
+    decompressed = cramjam.snappy.decompress(compressed)
+    assert bytes(decompressed) == b"bytes"