make the bundling work in a tmp buffer
make the bundling work in a tmp buffer

This avoids modifying the source picture.

Change-Id: I5b472859cda17fd3236a9e0fbedbb68977e09f85

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