Add uiaction sample to the list of samples to build if enabled.
The uiaction sample was never built under Unix, do add it to SAMPLES_SUBDIRS to enable building it if wxUSE_UIACTIONSIMULATOR==1. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@63742 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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