Improves the pattern to match the hunk-header for C/C++.
* js/userdiff-cc:
userdiff: have 'cpp' hunk header pattern catch more C++ anchor points
t4018: test cases showing that the cpp pattern misses many anchor points
t4018: test cases for the built-in cpp pattern
t4018: reduce test files for pattern compilation tests
t4018: convert custom pattern test to the new infrastructure
t4018: convert java pattern test to the new infrastructure
t4018: convert perl pattern tests to the new infrastructure
t4018: an infrastructure to test hunk headers
userdiff: support unsigned and long long suffixes of integer constants
userdiff: support C++ ->* and .* operators in the word regexp