remove -Wshadow warnings
remove -Wshadow warnings

"warning: declaration of ‘index’ shadows a global declaration"

Change-Id: I65f079aa4cd300cd1b3887a040b75c6b0f36ca1d

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