[patch] fix detecting of jffs2 and u-boot images

[Mike Frysinger]

jffs2 uses just 0x1985 as the magic number ... i dont know why file currently 
tries to also match 0xe001 or what that's for, but the latest mkfs.jffs2 
binary uses 0x2003 (or something, i forget exactly) ... the kernel itself 
doesnt care, so i dont think file should care either :)

the PPCBoot project is dead now as it has merged with ARMBoot and formed the 
basis of u-boot ... so ive updated the output to say "u-boot image" instead 
of "PPCBoot image"
-mike
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