gdb: use static library for gdbwire with alternate cflags
If we build the gdbwire amalgamation as a separate static library then we can alter the CFLAGS that are used to compile it. Given that it is an amalgamation and is C89-based rather than C11, this allows us to squash some warnings that are unhelpful. We link the library with libgnome-builder-plugins.so so the end effect should be identical to what we had before.
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