For silvermont, the __popcountsi2 symbol does not get exported by libc.
But for atom, this symbol is exported. Since we already exported this symbol
for previous releases, it's better to just follow through and force
the export, but only for 32 bit. x86 64 bit will not export this symbol.
Bug: 17681440
(cherry picked from commit d11eac3455a059a092ceee92eda9905e1d661e94)
Change-Id: I93704c721d98d569922f606f214069bda24872ba
6869d26ad9