Remove newline to be consistent

Co-authored-by: Fabio Niephaus <[email protected]>

native-maven-plugin/src/main/java/org/graalvm/buildtools/utils/NativeImageConfigurationUtils.java

@@ -128,7 +128,7 @@ public static Path getNativeImage(Logger logger) throws MojoExecutionException {
  }
 
  if (nativeImage == null) {
- throw new RuntimeException("The 'native-image' tool was not found on your system. " + System.lineSeparator() +
+ throw new RuntimeException("The 'native-image' tool was not found on your system. " +
  "Make sure that the JAVA_HOME or GRAALVM_HOME environment variables point to a GraalVM JDK, or that 'native-image' is on the system path.");
  }