glibc: Fix valgrind strlen must-be-redirected
glibc: Fix valgrind strlen must-be-redirected

valgrind: A must-be-redirected function
valgrind: whose name matches the pattern: strlen
valgrind: was not found whilst processing
valgrind: symbols from the object with soname: ld-linux-x86-64.so.2

Fixes Linuxbrew/homebrew-core#1005.
Closes Linuxbrew/homebrew-core#1042.

Signed-off-by: Shaun Jackman <b580dab3251a9622aba3803114310c23fdb42900@gmail.com>

maxim-belkin/homebrew-core,Linuxbrew/homebrew-core,maxim-belkin/homebrew-core,rwhogg/homebrew-core,LinuxbrewTestBot/homebrew-core,rwhogg/homebrew-core,Linuxbrew/homebrew-core,LinuxbrewTestBot/homebrew-core