Revert "grpc: update 1.6.0 bottle for Linuxbrew."
Revert "grpc: update 1.6.0 bottle for Linuxbrew."

This reverts commit ff3809f28c661478972d025ec31c8a11f66fba34.

Fix the error: Missing libraries: libgrpc++.so.1

grpc installs the file libgrpc++.so.4, but its ELF SONAME
is set to libgrpc++.so.1.

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