[cairo] WIN32 Font 15.14 Patch for difference malloc _cairo_malloc

[Friedrich Westermann]

Hello,

I have found a small Bug in the latest Cairo Win32. The change from malloc to _cairo_malloc breaks the
_cairo_win32_scaled_font_init_glyph_path

_cairo:malloc returns NULL for bytesGlyph 0.


Here is a Patch to fix it