[PATCH] JavaHL: Add SVN_JNI_STRING macro to reduce amount of code necessary to declare JNIStringHolder and check for exceptions

Please consider following patch for trunk:

[[[
JavaHL: Add SVN_JNI_STRING macro to reduce amount of code necessary to
declare
JNIStringHolder and check for exceptions

[ in subversion/bindings/javahl/native ]

* JNIStringHolder.h
  (SVN_JNI_STRING): New macro to declare JNIStringHolder local variable and
    return in case of exceptions
]]]

Thank you,

Vladimir