Log Message:
Update lcov to 1.13

Major changes and fixes since 1.9:
- fix parsing of gcc 4.7 gcov format
- make empty data directories non-fatal
- fix bug when converting function data in --diff operation
- fix handling of user-specified prefixes with trailing /
- fix whitespace handling in --rc command line option
- fix --config-file not being passed to geninfo
- fix --no-external not working with --initial
- Fix handling of non-english locales
- add exclude marker for branch coverage
- make geninfo compatible with LLVM's gcov
- Fix error when using --demangle-cpp
- Implement option to specify coverage rate precision
- make line exclusion markers configurable
- support a comma separated list of prefixes
- Allow prefix paths with spaces
- Fix --remove pattern matching
- Fix gcov version detection for XCode 8.0