GreenScreen: remove string_utils dependency

After inclusion of fmt/core.h The GreenScreen plugin was
failing to compile.

Change-Id: I493cc14d55d0519c1e5ea7b4de2ec8065473562b
diff --git a/GreenScreen/ffmpeg/rules.mak b/GreenScreen/ffmpeg/rules.mak
index ee69f58..33bdb42 100644
--- a/GreenScreen/ffmpeg/rules.mak
+++ b/GreenScreen/ffmpeg/rules.mak
@@ -1,4 +1,4 @@
-FFMPEG_HASH := n4.4
+FFMPEG_HASH := n4.4.2
 FFMPEG_URL := https://git.ffmpeg.org/gitweb/ffmpeg.git/snapshot/$(FFMPEG_HASH).tar.gz
 
 PKGS+=ffmpeg
@@ -339,7 +339,9 @@
 	$(APPLY) $(SRC)/ffmpeg/change-RTCP-ratio.patch
 	$(APPLY) $(SRC)/ffmpeg/rtp_ext_abs_send_time.patch
 	$(APPLY) $(SRC)/ffmpeg/libopusdec-enable-FEC.patch
-	$(APPLY) $(SRC)/ffmpeg/libopusenc-enable-FEC.patch
+	$(APPLY) $(SRC)/ffmpeg/libopusenc-reload-packet-loss-at-encode.patch
+	$(APPLY) $(SRC)/ffmpeg/ios-disable-b-frames.patch
+	$(APPLY) $(SRC)/ffmpeg/screen-sharing-x11-fix.patch
 	$(UPDATE_AUTOCONFIG)
 	$(MOVE)