debug/gdb: properly link with expat

This patch fixes libexpat detection for gdb-native and
gdb-cross static builds.

For gdb-native build configure should not touch system
/usr/{lib,include} directories while looking for libexpat.
To fix this we pass --without-libexpat-prefix flag
to configure script.

For gdb-cross build configure is allowed to investigate
system /usr/{lib,include} directories, but it does not
hurt to disable this behavior. In this case configure
falls back to -lexpat, which works as expected.

For more info:
http://marc.info/?l=gnulib-bug&m=129660262901148&w=2

Signed-off-by: Kirill Smirnov <kirill.k.smirnov@gmail.com>

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