Buildroot: fix for the GDB --disable-gdbmi problem

[Alessio Massaro]

The attachment solves an issue with buildroot doing configure
--disable-gdbmi for all release versions of gdb (i.e. all but snapshot).

That configure flag breaks the 6.4 build. One of the gdb maintainers
actually told me it should NOT be done.

I solved the issue by doing an
include toochain/gdb/$(GDB_VERSION)/*.mk
plus setting a couple of defaults in the main gdb.mk file
and creating version-specific .mk files accordingly. These can override the
above defaults.
This removes the need for ifeq($(GDB_VERSION),...) in gdb.mk

This trick might actually come handy to handle version specific settings for
any other package.

NB: I've kept the --disable-gdbmi flag for versions 6.3 and 6.2.1.
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