One compilation error with gcc -Wpedantic

[sgbeal]

$ gcc -c md4c.c -I. -Wall -Wpedantic
md4c.c:184:14: warning: ISO C forbids forward references to ‘enum’ types [-Wpedantic]
 typedef enum MD_LINETYPE_tag MD_LINETYPE;
              ^~~~~~~~~~~~~~~

Moving that typedef below the enum on the next line fixes it (the only -Wpedantic warning).

[mity]

Fixed. Thanks for reporting.