Fix duplicate symbols error in external/squashfs-tools

Two symbols bwriter_buffer and fwriter_buffer are duplicated when switch -fcommon to -fno-common. Keep the old default for this project until we get a fixed version from upstream.
Upstream fix patch: https://github.com/plougher/squashfs-tools/commit/fe2f5da4b0f8994169c53e84b7cb8a0feefc97b5

Bug: b/151457797
Test: mm
Change-Id: Ia233a947c217ba79129c576259594d9ec01f477a
1 file changed