e54ef175d4
Use checksrc.pl from the curl project, with (for now) suppressed long line warnings and indentation set to 4 spaces. Fixes are whitespace for the most part. Warning count went down from 2704 to 12. Also fix codespell typos, two non-ANSI C89 comments and a stray tab in include/libssh2.h. Ref: https://github.com/libssh2/libssh2/pull/235