Moving sizeof.exp:get_sizeof() in lib/gdb.exp

[Stephane Carrez]

Hi Andrew and Fernando,

For the following patchs:

[RFA]: Fix gdb.base/long_long.exp for targets with 2-byte pointers
[RFA]: Fix gdb.base/remote for embedded targets (HC11)

Andrew suggested to use the `sizeof.exp:get_sizeof()' procedure.

Rather than duplicating this procedure in several .exp file, would you
agree to put it in lib/gdb.exp?

I can submit a patch if this looks reasonable.

	Stephane

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