[Instrumented libraries] Symlink libcurl.so

This issue was exposed by the last instrumented libraries rebuild.
During development, I noticed libcurl.so was missing, so I manually
symlinked it and forgot about it.  But upon clean-building the
instrumented libraries, the symlink became missing.  This CL symlinks
libcurl.so as part of the package build.

R=thestig

Change-Id: I3d1e423cbe67917ffbd0375118ccdf22825ab3a6
Bug: 1260217
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4080588
Auto-Submit: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1079333}
NOKEYCHECK=True
GitOrigin-RevId: 47a5770f7c07ded09f0ccf85bff0bf04e956a0f1
2 files changed