riscvgc architecture uses static compilation

Author: rcitach

.github/workflows/build.yml

@@ -53,6 +53,7 @@ jobs:
           export XMAKE_ROOT=y # Only need to use "--root" in CI
           xmake --version
           source env.sh
+          export RT_XMAKE_LINK_TYPE="static"
           pushd apps
             xmake f -a ${{ matrix.arch }} -vyD
             xmake -j$(nproc) -vyD