avoid installing example_util.h
avoid installing example_util.h

older versions of automake (1.9) it seems would install the headers
regardless of the fact that the library was marked noinst_

this change follows some of the header guidance found here:
http://www.gnu.org/software/automake/manual/automake.html#Headers

Change-Id: I80acc00935097ebf36004e9871574fb9ef09aabf

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