Tools/setup/ubuntu.sh: Update to allow multiple host architectures

Tools/setup/ubuntu.sh

@@ -13,6 +13,7 @@
 
 INSTALL_NUTTX="true"
 INSTALL_SIM="true"
+INSTALL_ARCH=`uname -m`
 
 # Parse arguments
 for arg in "$@"
@@ -149,7 +150,7 @@ if [[ $INSTALL_NUTTX == "true" ]]; then
 
 	else
 		echo "Installing arm-none-eabi-gcc-${NUTTX_GCC_VERSION}";
-		wget -O /tmp/gcc-arm-none-eabi-${NUTTX_GCC_VERSION}-linux.tar.bz2 https://armkeil.blob.core.windows.net/developer/Files/downloads/gnu-rm/${NUTTX_GCC_VERSION_SHORT}/gcc-arm-none-eabi-${NUTTX_GCC_VERSION}-x86_64-linux.tar.bz2 && \
+		wget -O /tmp/gcc-arm-none-eabi-${NUTTX_GCC_VERSION}-linux.tar.bz2 https://armkeil.blob.core.windows.net/developer/Files/downloads/gnu-rm/${NUTTX_GCC_VERSION_SHORT}/gcc-arm-none-eabi-${NUTTX_GCC_VERSION}-${INSTALL_ARCH}-linux.tar.bz2 && \
 			sudo tar -jxf /tmp/gcc-arm-none-eabi-${NUTTX_GCC_VERSION}-linux.tar.bz2 -C /opt/;
 
 		# add arm-none-eabi-gcc to user's PATH