today's mythes commits introduced MSVC warnings

[Uwe Stöhr]

Compiling current master gives me now:

  D:\LyXGit\Master\3rdparty\mythes\1.2.5\mythes.cxx(38): warning C4996: 
'fopen': This function or variable may be unsafe. Consider using fopen_s 
instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online 
help for details. 
[D:\LyXGit\Master\compile-2015\3rdparty\mythes\mytheslibstatic.vcxproj]
  D:\LyXGit\Master\3rdparty\mythes\1.2.5\mythes.cxx(94): warning C4996: 
'fopen': This function or variable may be unsafe. Consider using fopen_s 
instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online 
help for details. 
[D:\LyXGit\Master\compile-2015\3rdparty\mythes\mytheslibstatic.vcxproj]
  D:\LyXGit\Master\3rdparty\mythes\1.2.5\mythes.cxx(247): warning 
C4996: 'strncpy': This function or variable may be unsafe. Consider 
using strncpy_s instead.
 To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help 
for details. 
[D:\LyXGit\Master\compile-2015\3rdparty\mythes\mytheslibstatic.vcxproj]
  D:\LyXGit\Master\3rdparty\mythes\1.2.5\mythes.cxx(249): warning 
C4996: 'strncpy': This function or variable may be unsafe. Consider 
using strncpy_s instead.
 To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help 
for details. 
[D:\LyXGit\Master\compile-2015\3rdparty\mythes\mytheslibstatic.vcxproj]

Can we ignore these warnings?

thanks and regards
Uwe