Allow passing extra flags to configure with depends builds.
[osx/mavericks] - on mavericks don't use pbo rendering with intel gpus as it might result in distorted rendering (ripple)
HttpHeader::GetCharset: remove unused variable
Merge pull request #3810 from t-nelson/depends_config_extra

Allow passing extra flags to configure with depends builds.
[depends] fixed, bad option on unzip, -o will overwrite and -q will keep it quiet
Merge pull request #3809 from Memphiz/fixripple2

[osx/mavericks] - on mavericks don't use pbo rendering with intel gpus
HttpHeader::GetCharset: fix charset extraction
CArchive: cosmetics: use parameter name corresponding to parameter type