bug#17443: Don't assume 'unsigned' is exactly 32 bits wide

[Paul Eggert]

I installed the attached patches, which port GNU grep's DFA code to 
unusual platforms where 'int' is wider than 32 bits.  A 
currently-produced example is the Unisys ClearPath MCP, where 'unsigned 
int' is 39 bits wide.

The 2nd patch is the real change; the other patches are minor cleanup. 
None of these changes should affect typical hosts where 'unsigned int' 
is 32 bits wide.

My source for that "39 bits" is page 4-490 of:

http://public.support.unisys.com/aseries/docs/clearpath-mcp-15.0/pdf/86002278-305.pdf

0001-maint-fix-indenting-to-pacify-prohibit_tab_based_ind.patch
Description: Text document

0002-dfa-don-t-assume-unsigned-int-is-exactly-32-bits-wid.patch
Description: Text document

0003-dfa-assume-C89-for-CHAR_BIT.patch
Description: Text document