fix URLs in BUILD.txt
---------------------
Key: ETCH-210
URL: https://issues.apache.org/jira/browse/ETCH-210
Project: Etch
Issue Type: Bug
Components: documentation
Environment: any
Reporter: Marco Molteni
Priority: Trivial
File BUILD.txt has broken urls in section "Setting up your
ETCH_EXTERNAL_DEPENDS".
Attached patch fixes them.
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