Fixed RPATH for python and tools cmake scripts.

[BlGene]

These changes were necessary to get the new cmake ( #1667) scripts to work on my system.
@Nerei @shelhamer

[Nerei]

@BlGene (CC: @shelhamer)

I took couple hours before I realized where is the bug :-) Explanation is here: #1939. Please take a look if this patch fixes your problems.

[Nerei]

@BlGene Please don't forget to clean install-tree before testing.

[BlGene]

This is fixed by @Nerei in a more elegant way in PR #1939.

[shelhamer]

Thanks for the initial fix @BlGene and follow-up @Nerei.
On Sun, Feb 22, 2015 at 10:23 BlGene notifications@github.com wrote:

This is fixed by @Nerei https://github.com/Nerei in a more elegant way
in PR #1939 #1939.

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#1897 (comment).