Remove unused macros from C headers

[adrians]

After grep-ing the code, I haven't found a single instance of them being used.
They look like being phased out a long time ago.

Also: It would be ok if I removed other strange chunks of code? Because I found this, and it's actually used in few places in the library.

#define OPENCV_CALL( Func )                                         \
{                                                                   \
Func;                                                           \
}

[adrians]

Also, I noticed that a portion of the library uses the define-and-goto based error handling (OPENCV_ERROR / CV_ERROR) while the other uses exceptions. It's ok to convert all of them to exceptions?

[SeninAndrew]

@vpisarev , could you please comment on this?

[vpisarev]

👍