Merge "Implement funopen64."

diff --cc libc/libc.arm.brillo.map
Simple merge

diff --cc libc/libc.arm.map
Simple merge

diff --cc libc/libc.arm64.map
Simple merge

diff --cc libc/libc.map.txt
Simple merge

diff --cc libc/libc.mips.brillo.map
Simple merge

diff --cc libc/libc.mips.map
Simple merge

diff --cc libc/libc.mips64.map
Simple merge

diff --cc libc/libc.x86.brillo.map
Simple merge

diff --cc libc/libc.x86.map
Simple merge

diff --cc libc/libc.x86_64.map
Simple merge