[llvm-cxxfilt] Re-enable the delimiters test on Windows.

The original intent was to enable this test for Windows; however, that
initial patch broke one of the build-bots.  I temporarily disabled this
test on Windows until that issue was resolved.  It was resolved in my
previous patch (cfd1d9742ee2d1b8dd6b7), and now I am re-enabling this
test.

llvm-svn: 355011

Author: Matt Davis

llvm/test/tools/llvm-cxxfilt/delimiters.test

@@ -1,4 +1,3 @@
-UNSUPPORTED: system-windows
 RUN: echo ',,_Z3Foo!' \
 RUN:      '_Z3Foo"'   \
 RUN:      '_Z3Foo#'   \