biology/emboss: fix build on powerpc*

ajfileio.c:271:7: warning: call to undeclared function 'ajSysFuncFgets'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]

cp = ajSysFuncFgets(&buff[ipos], isize, file->fp);
     ^

ajfileio.c:271:5: error: incompatible integer to pointer conversion assigning to 'const char *' from 'int' [-Wint-conversion]

cp = ajSysFuncFgets(&buff[ipos], isize, file->fp);
   ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

1 warning and 1 error generated.