Differences between GNU stabs and Sun native stabs.

• GNU C stabs define *all* types, file or procedure scope, as N_LSYM. Sun doc talks about using N_GSYM too.
• GNU C stabs use `ar' as type descriptor when defining arrays vs. just `a' in Sun doc.
• Stabs describing block scopes, N_LBRAC and N_RBRAC are supposed to contain the nesting level of the block in the desc field, re Sun doc. GNU stabs always have 0 in that field.
• Sun C stabs use type number pairs in the format (a,b) where a is a number starting with 1 and incremented for each sub-source file in the compilation. b is a number starting with 1 and incremented for each new type defined in the compilation. GNU C stabs use the type number alone, with no source file number.