[ruby-cvs:78507] c0d118f41a (master): Fix "cannot find the function: strcpy()" error on arm32 on Travis CI. (#2686)

Jun Aruga	2019-12-05 14:17:16 +0900 (Thu, 05 Dec 2019)

  New Revision: c0d118f41a

  https://github.com/ruby/ruby/commit/c0d118f41a

  Log:
    Fix "cannot find the function: strcpy()" error on arm32 on Travis CI. (#2686)
    
    This issue happened when `libc.so` and `libm.so` path were not found
    and `ldd ruby` command also failed to print the shared dependencies
    in `test/fiddle/helper.rb`.
    
    See https://travis-ci.org/ruby/ruby/jobs/611483288#L3018
    /home/travis/build/ruby/ruby/build/.ext/common/fiddle/import.rb:299:in `import_function': cannot find the function: strcpy() (Fiddle::DLError)
    
    * Set libc6:armhf as a installing dependency explicitly.
    * Remove arm32 from allow_failures.

  Modified files:
    .travis.yml
    test/fiddle/helper.rb