Restore accepting custom make command with extra options as the make
env variable
#4271
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What was the end-user or developer problem that led to this PR?
Debian's gem2deb passes a set of build variables to Rubygems extension builders using ENV['make']. These options are used to produce hardened binaries, as well as to help with reproducible builds.
After ad632bb, it no longer works.
What is your fix for the problem, implemented in this PR?
Consider this case and shellsplit it before passing it to process spawning helpers.
Make sure the following tasks are checked