Add NLL patch for syn

[Mark-Simulacrum]

Steps to make this PR:

cd collector/benchmarks/syn
# edit src/lib.rs to add #![feature(nll)] to top
# please make this the last patch in the folder, so if there's existing patches make it the next number
git diff --relative >> 1-nll.patch
git checkout -- src/lib.rs # get rid of the change you made
git add *-nll.patch
git commit