When BUILD_SRC contains a tailing '/', the file name used in compiling command
will contain '//', and it then goes to .o's debuginfo, confuses debugedit:
https://bugzilla.redhat.com/show_bug.cgi?id=304121
This patch uses realpath to makesure srctree and objtree don't have tailing '/'.
Signed-off-by: Wang Nan <wangnan0@xxxxxxxxxx>
Cc: Sasha Levin <sasha.levin@xxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Geng Hui <hui.geng@xxxxxxxxxx>
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