Revert #1634 #1664 to switch back to CentOS7 (#1674)

* Revert "Ensure gcc is newer >= 11.2.1 < 12.0.0 when building knn lib (#1664)"

This reverts commit da4cd1c.

Signed-off-by: Peter Zhu <zhujiaxi@amazon.com>

* Revert "Update gcc restrictions to version 12.0.0 (#1634)"

This reverts commit 11342be.

Signed-off-by: Peter Zhu <zhujiaxi@amazon.com>

---------

Signed-off-by: Peter Zhu <zhujiaxi@amazon.com>
(cherry picked from commit f432b0e)

scripts/build.sh

@@ -103,26 +103,17 @@ if [ "$JAVA_HOME" = "" ]; then
     echo "SET JAVA_HOME=$JAVA_HOME"
 fi
 
-# Ensure gcc version is > 11.2.1 and < 12.0.0 for faiss 1.7.4+ / SIMD Neon support on ARM64 compilation
+# Ensure gcc version is above 4.9.0 and at least 9.0.0 for faiss 1.7.4+ / SIMD Neon support on ARM64 compilation
 # https://github.com/opensearch-project/k-NN/issues/975
 # https://github.com/opensearch-project/k-NN/issues/1138
 # https://github.com/opensearch-project/opensearch-build/issues/4386
-# https://github.com/opensearch-project/opensearch-build/issues/4379#issuecomment-2067191682
-# https://github.com/opensearch-project/opensearch-build/issues/4379#issuecomment-2083623882
-# https://github.com/opensearch-project/opensearch-build/issues/4379#issuecomment-2084133839
 GCC_VERSION=`gcc --version | head -n 1 | cut -d ' ' -f3`
-GCC_REQUIRED_VERSION=11.2.1
+GCC_REQUIRED_VERSION=9.0.0
 COMPARE_VERSION=`echo $GCC_REQUIRED_VERSION $GCC_VERSION | tr ' ' '\n' | sort -V | uniq | head -n 1`
 if [ "$COMPARE_VERSION" != "$GCC_REQUIRED_VERSION" ]; then
     echo "gcc version on this env is older than $GCC_REQUIRED_VERSION, exit 1"
     exit 1
 fi
-GCC_REQUIRED_VERSION_CEILING=12.0.0
-COMPARE_VERSION_CEILING=`echo $GCC_REQUIRED_VERSION_CEILING $GCC_VERSION | tr ' ' '\n' | sort -V | uniq | tail -n 1`
-if [ "$COMPARE_VERSION_CEILING" != "$GCC_REQUIRED_VERSION_CEILING" ] && (echo "$OSTYPE" | grep -i linux); then
-    echo "gcc version on this env is newer than $GCC_REQUIRED_VERSION_CEILING, exit 1"
-    exit 1
-fi
 
 # Build k-NN lib and plugin through gradle tasks
 cd $work_dir