Enable librocksdb-sys to be built by rustc_codegen_cranelift #760
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When attempting to build
librocks-sys
usingrustc_codegen_cranelift
, you encounter a panic error caused by anunwrap
function in thebuild.rs
file. The error occurs because theunwrap
function is attempting to access theCARGO_CFG_TARGET_FEATURE
environment variable, which is not available in the cranelift platform.This PR adds a condition to check that the env variable actually exists instead of unwrapping it.