Fix logic error in OpenCVFindLibsGUI.cmake
When with_gtk is selected but GTK3 is not present the current logic fails to check for GTK2. This edit corrects this.
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@ -44,7 +44,8 @@ if(WITH_GTK AND NOT HAVE_QT)
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if(NOT WITH_GTK_2_X)
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CHECK_MODULE(gtk+-3.0 HAVE_GTK3)
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set(HAVE_GTK HAVE_GTK3)
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else()
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endif()
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if(NOT HAVE_GTK)
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CHECK_MODULE(gtk+-2.0 HAVE_GTK)
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if(HAVE_GTK AND (ALIASOF_gtk+-2.0_VERSION VERSION_LESS MIN_VER_GTK))
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message (FATAL_ERROR "GTK support requires a minimum version of ${MIN_VER_GTK} (${ALIASOF_gtk+-2.0_VERSION} found)")
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