[Bug 667308] build: Use "$SED" instead of "sed" directly and avoid the "-E" flag

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=667308
  GStreamer | gst-plugins-base | git

Tim-Philipp Müller <t.i.m> changed:

           What    |Removed                     |Added
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 Attachment #204626|none                        |rejected
             status|                            |

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