Support using T-head-Semi/csi-nn2 for RISC-V (#637)

build-riscv64-linux-gnu.sh

@@ -1,4 +1,5 @@
 #!/usr/bin/env bash
+set -ex
 
 if ! command -v riscv64-unknown-linux-gnu-g++  &> /dev/null; then
   echo "Please install the toolchain first."
@@ -42,8 +43,8 @@ export CPLUS_INCLUDE_PATH=$PWD/alsa-lib/include:$CPLUS_INCLUDE_PATH
 export SHERPA_ONNX_ALSA_LIB_DIR=$PWD/alsa-lib/src/.libs
 
 if [[ x"$BUILD_SHARED_LIBS" == x"" ]]; then
-  # By default, use static link
-  BUILD_SHARED_LIBS=OFF
+  # By default, use shared libraries
+  BUILD_SHARED_LIBS=ON
 fi
 
 cmake \