Archipelago » qemu

build: Use separate makefile for "trace/"

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
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Changes in v2:

• Do not depend on "qemu-timer-common.o".
• Use "$(obj)" in rules to refer to the build sub-directory....