Update k-NN build artifact script to enable SIMD on ARM for Faiss

Signed-off-by: Naveen Tatikonda <[email protected]>

CHANGELOG.md

@@ -24,6 +24,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 * Add patch to fix arm segfault in nmslib during ingestion [#1541](https://github.com/opensearch-project/k-NN/pull/1541)
 ### Infrastructure
 * Manually install zlib for win CI [#1513](https://github.com/opensearch-project/k-NN/pull/1513)
+* Update k-NN build artifact script to enable SIMD on ARM for Faiss [#1543](https://github.com/opensearch-project/k-NN/pull/1543)
 ### Documentation
 ### Maintenance
 * Bump faiss lib commit to 32f0e8cf92cd2275b60364517bb1cce67aa29a55 [#1443](https://github.com/opensearch-project/k-NN/pull/1443)

scripts/build.sh

@@ -93,11 +93,9 @@ if [ "$ARCHITECTURE" = "x64" ]; then
     sed -i -e 's/-march=native/-march=x86-64/g' external/nmslib/similarity_search/CMakeLists.txt
 fi
 
-# For arm, march=native is broken in centos 7. Manually override to lowest version of armv8. Also, disable simd in faiss
-# file. This is broken on centos 7 as well.
+# For arm, march=native is broken in centos 7. Manually override to lowest version of armv8.
 if [ "$ARCHITECTURE" = "arm64" ]; then
     sed -i -e 's/-march=native/-march=armv8-a/g' external/nmslib/similarity_search/CMakeLists.txt
-    sed -i -e 's/__aarch64__/__undefine_aarch64__/g' external/faiss/faiss/utils/distances_simd.cpp
 fi
 
 if [ "$JAVA_HOME" = "" ]; then