FindQt4: Don't fail if certain Qt modules are unavailable.
Qt4Macros: Handle Qt ActiveX libraries in qt4_use_modules.

These libraries have non-conventional variable names.
Merge topic 'find-Qt4-granular-modules' into next

b8af46c FindQt4: Don't fail if certain Qt modules are unavailable.
OS X: Add RPATH support for Mac.

RPATH support is activated on targets that have the MACOSX_RPATH
property turned on.
For install time, it is also useful to set INSTALL_RPATH to help
find dependent libraries with an @rpath in their install name.

Also adding detection of rpath conflicts when using frameworks.
Xcode: Add rpath support in Xcode generator.
OS X: Add support for @rpath in export files.

Also expand the IMPORTED_SONAME property for targets
to match the install_name.
OS X: Add test for rpaths on Mac.

This also tests rpaths through export/import.
Merge topic 'fix-qt4_use_modules-QtAx' into next

ce0c480 Qt4Macros: Handle Qt ActiveX libraries in qt4_use_modules.
Merge topic 'rpath-on-mac' into next

dc1d025 OS X: Add test for rpaths on Mac.
8576b3f OS X: Add support for @rpath in export files.
00d71bd Xcode: Add rpath support in Xcode generator.
94e7fef OS X: Add RPATH support for Mac.