gif2webp: simplify giflib version checking
gif2webp: simplify giflib version checking

introduce LOCAL_GIF_PREREQ/VERSION similar to the GCC variants in dsp.

Change-Id: I00ba5d523047b3b1c14ade992172e75e69043eb3

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