8273877: os::unsetenv unused

Reviewed-by: mdoerr, stuefe

Author: MBaesken

src/hotspot/os/posix/os_posix.cpp

@@ -160,12 +160,6 @@ int os::get_native_stack(address* stack, int frames, int toSkip) {
   return num_of_frames;
 }
 
-
-bool os::unsetenv(const char* name) {
-  assert(name != NULL, "Null pointer");
-  return (::unsetenv(name) == 0);
-}
-
 int os::get_last_error() {
   return errno;
 }

src/hotspot/os/windows/os_windows.cpp

@@ -258,11 +258,6 @@ static BOOL unmapViewOfFile(LPCVOID lpBaseAddress) {
   return result;
 }
 
-bool os::unsetenv(const char* name) {
-  assert(name != NULL, "Null pointer");
-  return (SetEnvironmentVariable(name, NULL) == TRUE);
-}
-
 char** os::get_environ() { return _environ; }
 
 // No setuid programs under Windows.

src/hotspot/share/runtime/os.hpp

@@ -186,8 +186,6 @@ class os: AllStatic {
   static jint init_2(void);                    // Called after command line parsing
                                                // and VM ergonomics processing
 
-  // unset environment variable
-  static bool unsetenv(const char* name);
   // Get environ pointer, platform independently
   static char** get_environ();