fix: use armv7l if process.config.variable.arm_version is undefined (#128)

Author: John Kleinschmidt

src/utils.ts

@@ -64,9 +64,8 @@ export function getNodeArch(arch: string) {
       case '6':
         return uname();
       case '7':
-        return 'armv7l';
       default:
-        break;
+        return 'armv7l';
     }
   }
 

test/utils.spec.ts

@@ -97,7 +97,7 @@ describe('utils', () => {
         value: 'arm',
       });
       process.config.variables = {} as any;
-      expect(getHostArch()).toEqual('arm');
+      expect(getHostArch()).toEqual('armv7l');
     });
 
     it('should return uname on arm 6', () => {