[libc] Partial revert of "[libc] Update supported riscv libs"

Partial revert of commit ee91799.

I can't reproduce the error locally, so let's revert it to keep the bots
happy.

Author: mikhailramalho

libc/config/linux/riscv64/entrypoints.txt

@@ -280,7 +280,6 @@ set(TARGET_LIBM_ENTRYPOINTS
     libc.src.math.llround
     libc.src.math.llroundf
     libc.src.math.llroundl
-    libc.src.math.log10
     libc.src.math.log10f
     libc.src.math.log1pf
     libc.src.math.log2f