[patch/obish] New file "gdb_obstack.h" part#1

[Andrew Cagney]

Hello,

The attached patch adds the header file "gdb_obstack.h" and then updates 
things to include that.

This is only the first part.  It turns out that "symtab.h" includes 
[gdb_]obstack.h when it doesn't need to.  Unfortuantly, many many files 
were relying on the include chain "symtab.h" -> "gdb_obstack.h" -> 
"obstack.h" -> <string.h>.  Removing that #include, breaks lots of 
builds :-(

I'm committing this.  I'll then follow this up with a patch to untangle 
the include mess.

enjoy,
Andrew
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