Auto merge of #2970 - pfmooney:solarish-libsendfile, r=JohnTitor
Auto merge of #2970 - pfmooney:solarish-libsendfile, r=JohnTitor

solarish: Fix libsendfile symbol dependency

A number of function symbols were erroneously grouped under the `libsendfile` link section.  This should correct the situation.

rust-lang/libc,rust-lang/libc,rust-lang/libc