avfilter/vf_geq: Relicense to LGPL

All authors who have code in this under GPL agreed.
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

LICENSE.md

@@ -35,7 +35,6 @@ Specifically, the GPL parts of FFmpeg are:
     - `vf_eq.c`
     - `vf_find_rect.c`
     - `vf_fspp.c`
-    - `vf_geq.c`
     - `vf_histeq.c`
     - `vf_hqdn3d.c`
     - `vf_kerndeint.c`

configure

@@ -3503,7 +3503,6 @@ freezedetect_filter_select="scene_sad"
 frei0r_filter_deps="frei0r libdl"
 frei0r_src_filter_deps="frei0r libdl"
 fspp_filter_deps="gpl"
-geq_filter_deps="gpl"
 headphone_filter_select="fft"
 histeq_filter_deps="gpl"
 hqdn3d_filter_deps="gpl"

libavfilter/vf_geq.c

@@ -4,19 +4,19 @@
  *
  * This file is part of FFmpeg.
  *
- * FFmpeg is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
  *
- * You should have received a copy of the GNU General Public License along
- * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**