Upgrade to libxml 2.9.2 and libxslt 1.1.28

third_party/libxslt/libxslt/win32config.h

Index: third_party/libxslt/libxslt/win32config.h
diff --git a/third_party/libxslt/libxslt/win32config.h b/third_party/libxslt/libxslt/win32config.h
index 00ba2a0ed428894d922525a3ce09c05eb9035a77..33bc57002ba7ae322b4f07fd65e59bebfa2086b0 100644
--- a/third_party/libxslt/libxslt/win32config.h
+++ b/third_party/libxslt/libxslt/win32config.h
@@ -28,12 +28,12 @@
 #include <math.h>
 #if defined _MSC_VER || defined __MINGW32__
 /* MS C-runtime has functions which can be used in order to determine if
-   a given floating-point variable contains NaN, (+-)INF. These are 
+   a given floating-point variable contains NaN, (+-)INF. These are
    preferred, because floating-point technology is considered propriatary
-   by MS and we can assume that their functions know more about their 
+   by MS and we can assume that their functions know more about their
    oddities than we do. */
 #include <float.h>
-/* Bjorn Reese figured a quite nice construct for isinf() using the 
+/* Bjorn Reese figured a quite nice construct for isinf() using the
    _fpclass() function. */
 #ifndef isinf
 #define isinf(d) ((_fpclass(d) == _FPCLASS_PINF) ? 1 \
@@ -78,8 +78,9 @@ static int isnan (double d) {
 
 #include <direct.h>
 #if defined(_MSC_VER) || defined(__MINGW32__)
-#define mkdir(p,m) _mkdir(p)
+#if _MSC_VER < 1900
 #define snprintf _snprintf
+#endif
 #if _MSC_VER < 1500
 #define vsnprintf(b,c,f,a) _vsnprintf(b,c,f,a)
 #endif