linux26: fixed to only copy Module.symvers file if linux26-src package is installed

base/linux26/linux26.conf

@@ -142,7 +142,7 @@ main_lx() {
 		# if module versions is enabled we need to copy 'Module.symvers'
 		# to be able to build external 3rd party kernel modules without
 		# rebuilding the whole kernel using the linux26-src package
-		if grep -q "CONFIG_MODVERSIONS=y" .config ; then
+		if grep -q "CONFIG_MODVERSIONS=y" .config && pkginstalled linux26-src ; then
 			echo "Copying Module.symvers -> /lib/modules/${lx_kernelrelease}/build/"
 			cp -v Module.symvers $root/lib/modules/${lx_kernelrelease}/build/
 		fi