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This CL is to build the libshared_memory_support_nacl.a for nacl_helper_nonsfi.
The library is not used yet, but will be used soon in following CLs.
Also, it should be built successfully now.

BUG=358465
TEST=Ran trybots. Implement nacl_helper_nonsfi on top of this CL, and made sure it works.

Review URL: https://codereview.chromium.org/656063003

Cr-Commit-Position: refs/heads/master@{#300459}