Tolerate idiosyncrasies of pre-0.7 ltrace.conf

- "void main(void);" accepted without warning to mean "void main();"
- "itn" accepted without warning to mean "int"
- "void main(void, xxx);" accepted with warning to mean
  "void main(hide(int), xxx);".  This gets warning, because shipped
  ltrace.conf never contained this idiom.

Update NEWS with explanation of the above.
2 files changed