It must be an absolute path in gotools/Makefile
It must be an absolute path in gotools/Makefile

This fixes #FAB-2950

while doing "make gotools", I get an err which is that "cannot
install, GOBIN must be an absolute path." The path should be an
abspath path.

Change-Id: I86e42e3f6617d664ea4ba20601f5fb87553f027c
Signed-off-by: hanwei <a210069d20ec3c0e4389c3b706a781f2939c80cc@qq.com>

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