[Travis CI] Coveralls failed to collect test coverage information

[lc-soft]

Describe the bug

The error message is like this:

test_char_render.gcno:version '402*', prefer 'A74*'
gcov: out of memory allocating 14819217432 bytes after a total of 0 bytes

I think this problem is caused by the version of clang that does not match the version of gcov.

To Reproduce

View this log: https://travis-ci.org/lc-soft/LCUI/jobs/595095567#L3734

Expected behavior Coveralls is able to collect test coverage information and have the converage badge display the correct percentage.

Environment (please complete the following information):

• LCUI version: develop branch
• Build tools: clang 7.0.0
• OS and version: Ubuntu 18.04.3 LTS

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