fix: warn Filehandle opened only for input for print/say to read-only fh (#439)

When printing to a filehandle opened for reading only, the builtin
print and say now set errno to Bad file descriptor, emit the warning
(when warnings enabled via io category), and return undef.

This was the last remaining Text::CSV failure: t/70_rt.t test 72.
All 40 Text::CSV test files now pass (52723/52723 subtests).

Generated with [Devin](https://cli.devin.ai/docs)

Co-authored-by: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

Author: fglock

src/main/java/org/perlonjava/core/Configuration.java

@@ -33,7 +33,7 @@ public final class Configuration {
      * Automatically populated by Gradle/Maven during build.
      * DO NOT EDIT MANUALLY - this value is replaced at build time.
      */
-    public static final String gitCommitId = "4aafb6057";
+    public static final String gitCommitId = "a7261e446";
 
     /**
      * Git commit date of the build (ISO format: YYYY-MM-DD).

src/main/java/org/perlonjava/runtime/operators/IOOperator.java

@@ -734,6 +734,14 @@ public static RuntimeScalar print(RuntimeList runtimeList, RuntimeScalar fileHan
         try {
             // Write the content to the file handle
             return fh.write(sb.toString());
+        } catch (java.nio.channels.NonWritableChannelException e) {
+            // Writing to a read-only filehandle (opened with "<")
+            getGlobalVariable("main::!").set("Bad file descriptor");
+            WarnDie.warnWithCategory(
+                    new RuntimeScalar("Filehandle opened only for input"),
+                    new RuntimeScalar(""),
+                    "io");
+            return new RuntimeScalar(); // undef
         } catch (Exception e) {
             getGlobalVariable("main::!").set("File operation failed: " + e.getMessage());
             return scalarFalse;
@@ -779,6 +787,14 @@ public static RuntimeScalar say(RuntimeList runtimeList, RuntimeScalar fileHandl
                 return scalarFalse;
             }
             return fh.write(sb.toString());
+        } catch (java.nio.channels.NonWritableChannelException e) {
+            // Writing to a read-only filehandle (opened with "<")
+            getGlobalVariable("main::!").set("Bad file descriptor");
+            WarnDie.warnWithCategory(
+                    new RuntimeScalar("Filehandle opened only for input"),
+                    new RuntimeScalar(""),
+                    "io");
+            return new RuntimeScalar(); // undef
         } catch (Exception e) {
             getGlobalVariable("main::!").set("File operation failed: " + e.getMessage());
             return scalarFalse;