HAVE_FEATURE_CRASHDUMP instead of manual SAL_ENABLE_CRASH_REPORT

Change-Id: Ifaf971d77f11cef207706989bba11dbe2028ca79
signal.c -> signal.cxx

Change-Id: I1d7f47b81e558a071a6beb52999d0bca185f02d5
Fold file_path_helper.h into file_path_helper.hxx

Change-Id: Ifad9594eb6fa396e32818b6d2bafc16adb478994
Remove obsolete osl_searchPath_impl

(obsoleting cid#983584)

Change-Id: Icbf25bd364fdabb208abe201ddc146daa60f9b62
loplugin:unreffun

Change-Id: I648b91e1124fcdad16ccd5d619192b72e4c8ec3f