gif2webp: silence a unused param warning
gif2webp: silence a unused param warning

Change-Id: I694857fc6adb011f19d14780de4f8c71e2719707

abwiz0086/webm.libwebp,ya7lelkom/libwebp,ericmckean/webm.libwebp,ttyangf/libwebp,Aexyn/libwebp,redengineer/libwebp,Maria1099/webm.libwebp,PKRoma/libwebp,cysp/libwebp,webmproject/libwebp,Tekserve/libwebp,ericmckean/webm.libwebp,abwiz0086/webm.libwebp,appunite/libwebp,redengineer/libwebp,Aexyn/libwebp,Acidburn0zzz/webm.libwebp,imazen/libwebp,keane83/BLE_IM,keane83/BLE_IM,matanbs/webm.libwebp,iniwf/webm.libwebp,ttyangf/libwebp,webmproject/libwebp,Aexyn/libwebp,zofuthan/libwebp,ya7lelkom/libwebp,ttyangf/libwebp,zofuthan/libwebp,reimaginemedia/webm.libwebp,zofuthan/libwebp,reimaginemedia/webm.libwebp,matanbs/webm.libwebp,comoyo/gonzo-libwebp,kim42083/webm.libwebp,Suvarna1488/webm.libwebp,yohunl/libwebp,kim42083/webm.libwebp,comoyo/gonzo-libwebp,ya7lelkom/libwebp,Suvarna1488/webm.libwebp,keane83/BLE_IM,comoyo/gonzo-libwebp,Maria1099/webm.libwebp,Distrotech/libwebp,kleopatra999/webm.libwebp,kalli123/webm.libwebp,keane83/BLE_IM,comoyo/gonzo-libwebp,jiehu5114/libwebp,yohunl/libwebp,appunite/libwebp,PKRoma/libwebp,webmproject/libwebp,reimaginemedia/webm.libwebp,altogother/webm.libwebp,rxl194/libwebp,redengineer/libwebp,appunite/libwebp,kim42083/webm.libwebp,gshORTON/webm.libwebp,matanbs/webm.libwebp,iniwf/webm.libwebp,kleopatra999/webm.libwebp,PKRoma/libwebp,zofuthan/libwebp,jiehu5114/libwebp,jacklicn/libwebp,altogother/webm.libwebp,Aexyn/libwebp,ya7lelkom/libwebp,ya7lelkom/libwebp,rxl194/libwebp,Acidburn0zzz/webm.libwebp,keane83/BLE_IM,comoyo/gonzo-libwebp,PKRoma/libwebp,abwiz0086/webm.libwebp,gshORTON/webm.libwebp,imazen/libwebp,kleopatra999/webm.libwebp,ericmckean/webm.libwebp,gshORTON/webm.libwebp,jacklicn/libwebp,Acidburn0zzz/webm.libwebp,jiehu5114/libwebp,rxl194/libwebp,Distrotech/libwebp,abwiz0086/webm.libwebp,Suvarna1488/webm.libwebp,kleopatra999/webm.libwebp,altogother/webm.libwebp,kim42083/webm.libwebp,yohunl/libwebp,redengineer/libwebp,abwiz0086/webm.libwebp,kalli123/webm.libwebp,iniwf/webm.libwebp,imazen/libwebp,altogother/webm.libwebp,Tekserve/libwebp,Acidburn0zzz/webm.libwebp,kalli123/webm.libwebp,rxl194/libwebp,webmproject/libwebp,ttyangf/libwebp,iniwf/webm.libwebp,gshORTON/webm.libwebp,jacklicn/libwebp,yohunl/libwebp,Suvarna1488/webm.libwebp,matanbs/webm.libwebp,cysp/libwebp,Distrotech/libwebp,kleopatra999/webm.libwebp,webmproject/libwebp,iniwf/webm.libwebp,reimaginemedia/webm.libwebp,jiehu5114/libwebp,gshORTON/webm.libwebp,jacklicn/libwebp,imazen/libwebp,Aexyn/libwebp,cysp/libwebp,kalli123/webm.libwebp,Maria1099/webm.libwebp,appunite/libwebp,PKRoma/libwebp,Maria1099/webm.libwebp,zofuthan/libwebp,jiehu5114/libwebp,rxl194/libwebp,Suvarna1488/webm.libwebp,ttyangf/libwebp,appunite/libwebp,kim42083/webm.libwebp,kalli123/webm.libwebp,yohunl/libwebp,comoyo/gonzo-libwebp,Tekserve/libwebp,comoyo/gonzo-libwebp,jacklicn/libwebp,altogother/webm.libwebp,Maria1099/webm.libwebp,ericmckean/webm.libwebp,imazen/libwebp,Acidburn0zzz/webm.libwebp,reimaginemedia/webm.libwebp,cysp/libwebp,ericmckean/webm.libwebp,appunite/libwebp,matanbs/webm.libwebp,PKRoma/libwebp,Tekserve/libwebp,redengineer/libwebp