fix file naming snafu

BKrev: 40cf0847qrcJ-2_rbpAkN86IwrCRvg

diff --git a/libgpewidget/libgpewidget-0.83/header.diff b/libgpewidget/libgpewidget-0.83/header.patch
similarity index 100%
rename from libgpewidget/libgpewidget-0.83/header.diff
rename to libgpewidget/libgpewidget-0.83/header.patch