Support wasm32-wasi

[tmfink]

Requirements

• clang-8 (available at https://apt.llvm.org/)
• WASI sysroot from https://github.com/CraneStation/wasi-libc
• wasm-wasi target for nightly rust toolchain:

  rustup target add --toolchain nightly wasm32-wasi

• wasmer (to run WASI executable): https://wasmer.io/

Build cstool

Tell cc crate to use our WASI sysroot and clang-8 compiler:

cd cstool  # go to path with cstool dir
CFLAGS_wasm32_wasi="--sysroot=/path/to/wasi/sysroot" \
    CC=clang-8 \
    cargo +nightly build --target=wasm32-wasi

Run cstool

cd cstool  # go to path with cstool dir
wasmer run ../target/wasm32-wasi/debug/cstool.wasm -- --arch x86 --mode mode32 --code 909090e812345678

[codecov[bot]]

Codecov Report

Merging #70 into master will increase coverage by 0.75%. The diff coverage is 95%.

@@            Coverage Diff             @@
##           master      #70      +/-   ##
==========================================
+ Coverage   94.82%   95.57%   +0.75%     
==========================================
  Files          19       19              
  Lines        3727     4381     +654     
==========================================
+ Hits         3534     4187     +653     
- Misses        193      194       +1

Impacted Files	Coverage Δ
capstone-rs/src/arch/arm.rs	90.21% <ø> (-0.2%)	:arrow_down:
capstone-rs/src/arch/mips.rs	97.5% <ø> (ø)	:arrow_up:
capstone-rs/src/arch/xcore.rs	92.5% <ø> (+0.19%)	:arrow_up:
capstone-rs/src/capstone.rs	98.46% <ø> (+2.8%)	:arrow_up:
capstone-rs/src/arch/sparc.rs	94.59% <ø> (+3.29%)	:arrow_up:
capstone-rs/src/arch/mod.rs	92.85% <ø> (+1.45%)	:arrow_up:
capstone-rs/src/arch/tms320c64x.rs	99.02% <ø> (+1.35%)	:arrow_up:
capstone-rs/src/instruction.rs	88.43% <ø> (ø)	:arrow_up:
capstone-rs/src/arch/evm.rs	86.11% <ø> (-2.36%)	:arrow_down:
capstone-rs/src/ffi.rs	100% <ø> (ø)	:arrow_up:
... and 20 more

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[tmfink]

https://github.com/rust-lang/libc/pull/1407 fixes the issue:

cannot find type `c_schar` in module `libc`