Enable Chart XShape tests on Windows by default

They pass both locally and on CI builds on Windows, so I think they
are reliable enough to be enabled by default. On Linux CI builds one
tests is failing but not locally, so not enabling them on Linux for
now. Mac is a whole different story with most of the tests failing.

Change-Id: I1f2cf6f318ddce3c68d7353c49fc510f895bbb6a
Reviewed-on: https://gerrit.libreoffice.org/33173Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Khaled Hosny <khaledhosny@eglug.org>

configure.ac

@@ -9429,7 +9429,7 @@ dnl ===================================================================
 dnl Check for enabling chart XShape tests
 dnl ===================================================================
 AC_MSG_CHECKING([whether to execute chart XShape tests])
-if test "$enable_chart_tests" = "yes"; then
+if test "$enable_chart_tests" = "yes" -o '(' "$_os" = "WINNT" -a "$enable_chart_tests" != "no" ')'; then
     AC_MSG_RESULT([yes])
     ENABLE_CHART_TESTS=TRUE
     AC_SUBST(ENABLE_CHART_TESTS)