popsicle doesn't seem to support relative paths #14
Description
$ ~/git/popsicle/target/release/popsicle ./src/third_party/llvm-build/Release+Asserts/bin/clang
Error: cannot find external program: "./src/third_party/llvm-build/Release+Asserts/bin/clang"
$ ~/git/popsicle/target/release/popsicle `pwd`/src/third_party/llvm-build/Release+Asserts/bin/clang
$HOME/.cache/popsicle/clang/clang-6.0.0.tar.gz
The pointed clang is a normal binary file:
$ file ./src/third_party/llvm-build/Release+Asserts/bin/clang
clang: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.24, stripped