Build static GNU toolchain

Author: luismarques

lowrisc-toolchain-gcc-rv32imcb.config

@@ -73,5 +73,8 @@ CT_GCC_DEVEL_VCS_git=y
 CT_GCC_DEVEL_URL="https://github.com/riscv-collab/riscv-gcc"
 CT_GCC_DEVEL_REVISION="73055647d33c0b63a3125c372019d1dac0f8ac34"
 
+CT_STATIC_TOOLCHAIN=y
+CT_GDB_CROSS_STATIC=y
+
 # The build script appends a definition of CT_LOCAL_PATCH_DIR down here, that
 # points to the repo's patch directory.