archivers/snappy-java: force disable NEON on armv7

Cross compilation might pick up NEON from the host aarch64 system
in our package build cluster.
This gave an error:
In file included from target/snappy-1.1.10/snappy.cc:29:
target/snappy-1.1.10/snappy-internal.h:107:10: error: use of undeclared identifier 'vqtbl1q_u8'; did you mean 'vtbl1_u8'?

107 |   return vqtbl1q_u8(input, shuffle_mask);
    |          ^~~~~~~~~~
    |          vtbl1_u8

PR: 282272
Approved by: Angelo Polo (maintainer) (via earlier comment in the PR)