re PR libgcj/23758 (java::lang::ConcreteProcess::nativeSpawn unsafe)

PR libgcj/23758
	* java/lang/natPosixProcess.cc (nativeSpawn): Move building of
	environment before the fork.
	* testsuite/libjava.lang/Process_7.java: New test.
	* testsuite/libjava.lang/Process_7.out: Its expected results.
	* testsuite/libjava.lang/Process_7.jar: Generated file.

From-SVN: r123676

libjava/testsuite/libjava.lang/Process_7.java

@@ -0,0 +1,45 @@
+// Verify we can modify the environment.
+import java.io.BufferedReader;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.Map;
+
+
+
+public class Process_7
+{
+  public static void main(String[] args)
+  {
+    try
+      {
+        ProcessBuilder pb = new ProcessBuilder("env");
+        Map<String, String> e = pb.environment();
+        e.clear();
+        String v = "process7_value";
+        String k = "PROCESS_7_KEY";
+        e.put(k, v);
+	Process p = pb.start();
+	InputStream is = p.getInputStream();
+	InputStreamReader isr = new InputStreamReader(is);
+	BufferedReader br = new BufferedReader(isr);
+        boolean found = false;
+
+	String result;
+        while ((result = br.readLine()) != null)
+          {
+            if (result.equals(k + '=' + v))
+              found = true;
+          }
+	if (!found)
+	  {
+	    System.out.println("bad");
+	    return;
+	  }
+	System.out.println("ok");
+      }
+    catch (Exception ex)
+      {
+	System.out.println(ex.toString());
+      }
+  }
+}