fix gdb-6.7.1 (bug 0002824)

Hi,

* Remove patches:
- 100-uclibc-conf.patch
- 700-nios2-6.6.patch

* Use 600-fix-compile-flag-mismatch.patch attached.

An extra patch is added to add --disable-werror to gdb on host. It fixes build failure when gcc >= 4.3 is used:
symtab.c:2252: error: 'exact' may be used uninitialized in this function

cheers,

Fathi
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