build: Build with gcr4 by default
Use -Dgcr3=true to build against gcr3 instead.
The gcr4 is going to replace gcr3, this change prepares it to do. it also defaults to build with gcr4 for the same reason.
Use -Dgcr3=true to build against gcr3 instead.
The gcr4 is going to replace gcr3, this change prepares it to do. it also defaults to build with gcr4 for the same reason.