LangInfo: don't try to resolve language "default"
StringUtils::EqualsNoCase: optimization
Almost equal speed (compared to old version) when strings are full different case.
Much faster if some chars in strings have same case.
droid: mediacodec, add temp logging
darwin: add missing NDEBUG/_DEBUG flags
osx: fixed build under 10.6.8 were memmem from libmicrohttpd collides with memmem in libgnutils
Merge pull request #3425 from Karlson2k/stringutils_optim_01

Optimization of StringUtils::EqualsNoCase
Merge pull request #3426 from Karlson2k/langinfo_fix_02

FIX: LangInfo: don't try to resolve language "default"
settings: fix parsing of "help" attribute for categories