[Crash-utility] Two small issues in is_compressed_kernel()

[HATAYAMA Daisuke]

When I was using crash 5.1.4, I found two small issues in
is_compressed_kernel().

1) For vmlinux compressed with bzip2, is_compressed_kernel() is
forgetting to use basename() to a given file name before comparing it
with "vmlinux", due to which specifying vmlinux by relative or
absolute path lets a given vmlinux unintensionally interpreted as an
unsuported format. See an attached patch, though it's very obvious.

2) is_compressed_kernel() is assuming gunzip and bunzip2 are located
in /usr/bin/, but on Ubuntu they are located in /bin/, so
uncompression fails on Ubuntu due to No such file error. Could you add
a static or dynamic processing of detecting where binaries are
located?

Thanks.
HATAYAMA, Daisuke
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