编译freetype 的dll

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因需要给python使用freetype库，so需要一个freetype的dll

2 steps

1. 在VC中设置输出为动态链接库

2. 修改ftoption.h

在284行增加2行代码即可

/*************************************************************************/
/* */
/* DLL export compilation */
/* */
/* When compiling FreeType as a DLL, some systems/compilers need a */
/* special keyword in front OR after the return type of function */
/* declarations. */
/* */
/* Two macros are used within the FreeType source code to define */
/* exported library functions: FT_EXPORT and FT_EXPORT_DEF. */
/* */
/* FT_EXPORT( return_type ) */
/* */
/* is used in a function declaration, as in */
/* */
/* FT_EXPORT( FT_Error ) */
/* FT_Init_FreeType( FT_Library* alibrary ); */
/* */
/* */
/* FT_EXPORT_DEF( return_type ) */
/* */
/* is used in a function definition, as in */
/* */
/* FT_EXPORT_DEF( FT_Error ) */
/* FT_Init_FreeType( FT_Library* alibrary ) */
/* { */
/* ... some code ... */
/* return FT_Err_Ok; */
/* } */
/* */
/* You can provide your own implementation of FT_EXPORT and */
/* FT_EXPORT_DEF here if you want. If you leave them undefined, they */
/* will be later automatically defined as `extern return_type' to */
/* allow normal compilation. */
/* */
/* Do not #undef these macros here since the build system might define */
/* them for certain configurations only. */
/* */
/* #define FT_EXPORT(x) extern x */
/* #define FT_EXPORT_DEF(x) x */
#define FT_EXPORT(x) __declspec(dllexport) x
#define FT_BASE(x) __declspec(dllexport) x