fix EXIF parsing in PNG
fix EXIF parsing in PNG

'exiftool' puts an 'APP1' chunk for exif, e.g.:
https://metacpan.org/source/EXIFTOOL/Image-ExifTool-5.87/lib/Image/ExifTool/PNG.pm#L305

Change-Id: I313d3e6945898526b8a4baf3d9016a2591a1a817

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