code: plan9front

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file: detect webp files (thanks kemal)

this patch adds a small check to the "iff" function, so this
way file can detect webp files. tested with a webp file i
found randomly.

--- a/sys/src/cmd/file.c

+++ b/sys/src/cmd/file.c

@@ -962,6 +962,8 @@

 			print("%s\n", mime? "audio/wave": "wave audio");

 		else if (strncmp((char*)buf+8, "AVI ", 4) == 0)

 			print("%s\n", mime? "video/avi": "avi video");

+		else if (strncmp((char*)buf+8, "WEBP", 4) == 0)

+			print("%s\n", mime? "image/webp": "webp image");

 		else

 			print("%s\n", mime? OCTET : "riff file");

 		return 1;