error: unknown type name ‘size_t’ at crypto/c_groestl.c

[rumatoest]

Compilation does not work at ubuntu 16.04 because

crypto/c_groestl.c: In function ‘Init’:
crypto/c_groestl.c:209:7: error: unknown type name ‘size_t’
   for(size_t i = 0;i<(SIZE512/sizeof(uint32_t));i++)

Adding #include <stddef.h> to crypto/c_groestl.c fix issue