Instrumented libraries: update the libnspr4 build script.

There has been a security update in Precise which changed the paths somewhat.

BUG=313751
TBR=glider@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/600793002

Cr-Commit-Position: refs/heads/master@{#296395}
1 file changed