[QScintilla] compiling QScintilla on MacOS

[Brook Milligan]

Compiling QScintilla on MacOS seems to yield libraries without a full path for LC_ID_DYLIB, which is set by the -install_name linker argument.  The solution is to add a definition for QMAKE_SONAME_PREFIX in qscintilla.pro.  

Below is a patch to accomplish this.  Please consider applying this to the codebase.

Thanks a lot.

Cheers,
Brook

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