jscript: Implement the String.toUpperCase() method.

[Andrew Nguyen]

Since I submitted a patch that implements String.toLowerCase(), I
figured I might as well implement the corresponding upper case method.
Tests pass on Windows XP.
---
 dlls/jscript/string.c     |   30 ++++++++++++++++++++++++++++--
 dlls/jscript/tests/api.js |   11 +++++++++++
 2 files changed, 39 insertions(+), 2 deletions(-)
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