perf tools: Fix build breakage if prefix= is specified
Invoking Makefile.perf with prefix= breaks the build since Makefile.perf hands that variable down to Makefile.build where it overrides prefix := $(subst ./,,$(OUTPUT)$(dir)/) leading to errors like this: No rule to make target '/usrabspath.o', needed by '/usrlibperf-in.o' Signed-off-by: NLukas Wunner <lukas@wunner.de> Acked-by: NJiri Olsa <jolsa@kernel.org> Cc: David Ahern <dsahern@gmail.com> Fixes: c819e2cf Link: http://lkml.kernel.org/r/5582c48a.84a22b0a.a918.5285SMTPIN_ADDED_MISSING@mx.google.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
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