replace x*155/100 by x*101581>>16
replace x*155/100 by x*101581>>16

Don't expect a visible speed diff. it's just cool.
(and, that's one less TODO in the code).

Change-Id: Iaeb2f1c930debb51501e170ee806f2f945fb1a8d

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