Need to print the exception message to give more information

If running on a system that does not have the required glibc
version then important information is lost to tell the user
what is wrong. For example:

version 'GLIBC_2.34' not found (required by .../libswt-pi3-gtk-4966r6.so)

bundles/org.eclipse.swt/Eclipse SWT PI/gtk/org/eclipse/swt/internal/gtk/OS.java

@@ -86,13 +86,15 @@ public class OS extends C {
 			try {
 				Library.loadLibrary("swt-pi4");
 			} catch (Throwable e) {
+				System.err.println(e.getMessage());
 				System.err.println("SWT OS.java Error: Failed to load swt-pi4, loading swt-pi3 as fallback.");
 				Library.loadLibrary("swt-pi3");
 			}
 		} else {
 			try {
 				Library.loadLibrary("swt-pi3");
 			} catch (Throwable e) {
+				System.err.println(e.getMessage());
 				System.err.println("SWT OS.java Error: Failed to load swt-pi3, loading swt-pi4 as fallback.");
 				Library.loadLibrary("swt-pi4");
 			}