implement new MimeType constants since cairo 1.14
Merge pull request #28 from cosmo0920/add-new-const-1.14

implement new MimeType constants since cairo 1.14

Patch by Hiroshi Hatake. Thanks!!!
windows: bump up libpng version
windows: bump up pixman version
windows: bump up cairo version
windows: add cairo 1.14 patch to fix following configure failure

checking whether float word ordering is bigendian... strings:
'conftest': No such file
strings: 'conftest': No such file
unknown
configure: error:

Unknown float word ordering. You need to manually preset
ax_cv_c_float_words_bigendian=no (or yes) according to your system.
windows: bump up libxml2 version

And added MinGW32 compilable patch.
${Z_DIR} is suddenly empty.... :<