Use cl_assert_equal_s() instead of strcmp().

Replaced all cl_assert(!strcmp()) or semantically equivalent forms
by cl_assert_equal_s().
clone: Prevent segfault upon faulted remote creation
config: support trailing backslashes

Check whether the backslash at the end of the line is being escaped or
not so as not to consider it a continuation marker when it's e.g. a
Windows-style path.
Merge pull request #1280 from nulltoken/fix/clone-segfault

clone: Prevent segfault upon faulted remote creation
Merge pull request #1279 from carlosmn/config-trailing-backslash

config: support trailing backslashes
Fix 3 memory leaks
Improve valgrind suppressions
Merge pull request #1281 from phkelley/valgrind

Improve valgrind suppressions
Merge pull request #1278 from sba1/cl-assert-equal-s

Use cl_assert_equal_s() instead of strcmp().
Expand valgrind suppressions even more for libssl, libcrypto
Fix a mutex leak in pack.c