cmake: Do not install private headers.

The headers installed in the private directory seem to be unnecessary
when building other applications or libraries that use TQScintilla
library. Therefore, there is no obvious reason to be installed.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>

qt/CMakeLists.txt

@@ -78,11 +78,3 @@ install(
     FILES ${_includes}
     DESTINATION ${TQT_INCLUDES_DIR}
 )
-
-file( GLOB _privates ${CMAKE_SOURCE_DIR}/include/*.h )
-
-install(
-    FILES ${_privates}
-    DESTINATION ${TQT_INCLUDES_DIR}/private
-)
-