src: Remove unused __init_cwd() and INITIAL_CWD.
This function and object are not used in any other code in the source tree. Their presence causes the build on CloudABI to fail, due to it not providing a global filesystem namespace to begin with.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines
Affected core subsystem(s)
src