Update erlang.mk

[J3RN]

This project was failing to compile under OTP-27 with the following error:

Runtime terminating during boot ({undef,[{file,pid2name,[<0.81.0>],[]},{erl_eval,do_apply,7,[{file,"erl_eval.erl"},{line,900}]},{erl_eval,expr,6,[{file,"erl_eval.erl"},{line,648}]},{erl_eval,exprs,6,[{file,"erl_eval.erl"},{line,271}]},{erl_eval,eval_lc1,7,[{file,"erl_eval.erl"},{line,929}]},{erl_eval,eval_generate,8,[{file,"erl_eval.erl"},{line,1003}]},{erl_eval,eval_lc,7,[{file,"erl_eval.erl"},{line,917}]},{erl_eval,exprs,6,[{file,"erl_eval.erl"},{line,271}]}]})

I traced this error to erlang.mk. I pulled in the latest version and it appears to build fine now.