cleanup native code warnings

http://mail.openjdk.java.net/pipermail/build-dev/2013-December/011332.html

Below are some warnings produced by the build of jdk8.

Z:/JDK/jdk8/jdk/src/share/native/java/lang/Throwable.c(48) : warning C4028:
paramétre formel 3 différent de la déclaration
Z:/JDK/jdk8/jdk/src/windows/native/java/io/WinNTFileSystem_md.c(363) : warning
C4101: 'pathlen': variable locale non référencée
Z:/JDK/jdk8/jdk/src/windows/native/common/jdk_util_md.c(45) : warning C4101:
'ret': variable locale non référencée
Z:/JDK/jdk8/jdk/src/share/bin/java.c(1253) : warning C4101: 'result': variable
locale nonréférencée
Z:/JDK/jdk8/jdk/src/share/bin/parse_manifest.c(196) : warning C4244: 'fonction':
conversion de 'jlong' en 'unsigned int', perte possible de données



And here are the fixes

diff --git a/src/share/bin/java.c b/src/share/bin/java.c
--- a/src/share/bin/java.c
+++ b/src/share/bin/java.c
@@ -1250,7 +1250,6 @@
  GetApplicationClass(JNIEnv *env)
  {
      jmethodID mid;
- jobject result;
      jclass cls = GetLauncherHelperClass(env);
      NULL_CHECK0(cls);
      NULL_CHECK0(mid = (*env)->GetStaticMethodID(env, cls,
diff --git a/src/share/bin/parse_manifest.c b/src/share/bin/parse_manifest.c
--- a/src/share/bin/parse_manifest.c
+++ b/src/share/bin/parse_manifest.c
@@ -193,7 +193,7 @@
          return (-1);
      if ((buffer = malloc(END_MAXLEN)) == NULL)
          return (-1);
- if ((bytes = read(fd, buffer, len)) < 0) {
+ if ((bytes = read(fd, buffer, (size_t)len)) < 0) {
          free(buffer);
          return (-1);
      }
diff --git a/src/share/native/java/lang/Throwable.c
b/src/share/native/java/lang/Throwable.c
--- a/src/share/native/java/lang/Throwable.c
+++ b/src/share/native/java/lang/Throwable.c
@@ -44,7 +44,7 @@
   * `this' so you can write 'throw e.fillInStackTrace();'
   */
  JNIEXPORT jobject JNICALL
-Java_java_lang_Throwable_fillInStackTrace(JNIEnv *env, jobject throwable, int
dummy)
+Java_java_lang_Throwable_fillInStackTrace(JNIEnv *env, jobject throwable, jint
dummy)
  {
      JVM_FillInStackTrace(env, throwable);
      return throwable;
diff --git a/src/windows/native/common/jdk_util_md.c
b/src/windows/native/common/jdk_util_md.c
--- a/src/windows/native/common/jdk_util_md.c
+++ b/src/windows/native/common/jdk_util_md.c
@@ -42,7 +42,6 @@
  JNIEXPORT HMODULE JDK_LoadSystemLibrary(const char* name) {
      HMODULE handle = NULL;
      char path[MAX_PATH];
- int ret;

      if (GetSystemDirectory(path, sizeof(path)) != 0) {
          strcat(path, "\\");
diff --git a/src/windows/native/java/io/WinNTFileSystem_md.c
b/src/windows/native/java/io/WinNTFileSystem_md.c
--- a/src/windows/native/java/io/WinNTFileSystem_md.c
+++ b/src/windows/native/java/io/WinNTFileSystem_md.c
@@ -360,7 +360,6 @@
                                                    jobject file)
  {
      jint rv = 0;
- jint pathlen;

      WCHAR *pathbuf = fileToNTPath(env, file, ids.path);
      if (pathbuf == NULL)