Commits on Jan 14, 2021

1. build: always specify PORTABLE=1 when building RocksDB …

   Something recently changed on the TC agents (presumably usage of a new
   machine type with a different CPU) so that using `-march=native` when
   building RocksDB causes AVX512 instructions to be used which are not
   present on roachprod machines. The result is that binaries built in this
   way will die with "illegal instruction". RocksDB has a mechanism to
   disable the use of `-march=native`: pass `PORTABLE=1` to the make
   command. We were already doing this for release builds. Now we're doing
   it for all builds.
   
   Fixes cockroachdb#58754
   
   Release note: none

   

   petermattis committed Jan 14, 2021
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