package/squashfs: fix host compile multiple definitions

[HinTak]

Add upstream patch to fix squashfs-tools build failures because of missing external declaration for fwriter_buffer and bwriter_buffer.

Fixes:

• http://autobuild.buildroot.net/results/6789b668898245926e0a3a3e7caf823dff515d71

  /usr/bin/ld: read_fs.o:(.bss+0x0): multiple definition of fwriter_buffer'; mksquashfs.o:(.bss+0x400c90): first defined here /usr/bin/ld: read_fs.o:(.bss+0x8): multiple definition ofbwriter_buffer'; mksquashfs.o:(.bss+0x400c98): first defined here

Signed-off-by: Peter Seiderer ps.report@gmx.net Signed-off-by: Yann E. MORIN yann.morin.1998@free.fr

[HinTak]

Taken verbatim from upstream buildroot: https://git.busybox.net/buildroot/commit/?id=8d7b714027b451df6b202cee5d85ff6bbf3fe624

Sorry about the weird authorship - I just did 'git am ..' after adjusting the upstream patch.