extract-vmlinux: update to check to search "MS-DOS executable"

instead of check if there is a line that ends with "MS-DOS executable",
as on some host OS, there might be other information printed
after "MS-DOS executable".

Like on Debian OS, the output is something like following:
$ cat /etc/issue
Debian GNU/Linux bullseye/sid \n \l

$ file cuttlefish_assembly/vmlinux
cuttlefish_assembly/vmlinux: MS-DOS executable PE32+ executable (EFI application) Aarch64 (stripped to external PDB), for MS Windows
$

Test: boot test manually with launch_cvd command

Signed-off-by: Yongqin Liu <yongqin.liu@linaro.org>
Change-Id: I0e6d761271f4182d8efa45a1851e4a3bea013952
1 file changed
tree: 010906ce83f6a884bfbdc19df6029cb165e81a26
  1. 5.4-arm64/
  2. 5.4-x86_64/
  3. scripts/
  4. Android.bp
  5. METADATA
  6. OWNERS
  7. TEST_MAPPING