gdb vendor branch: Bring in additional source files

The tui mode of gdb will not function when the readline library is
replaced with libedit. Bring in readline sources to build gdb
properly. The r

gdb vendor branch: Bring in additional source files

The tui mode of gdb will not function when the readline library is
replaced with libedit. Bring in readline sources to build gdb
properly. The readline library will be used internally to gdb only.

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