Compile warnings with new go-sqlite3 dep

[aquarapid]

We recently integrated some orchestrator code that depends on sqlite, and uses the go-sqlite3 module.

On newer gcc versions this will throw a warning during a (clean build):

$ make clean ; make
Wed Aug 26 09:24:23 PDT 2020: Building source tree
# github.com/mattn/go-sqlite3
sqlite3-binding.c: In function ‘sqlite3SelectNew’:
sqlite3-binding.c:129019:10: warning: function may return address of local variable [-Wreturn-local-addr]
129019 |   return pNew;
       |          ^~~~
sqlite3-binding.c:128979:10: note: declared here
128979 |   Select standin;
       |          ^~~~~~~

Upstream issue is mattn/go-sqlite3#803 , but it does not seem like it will be addressed soon, and even if it does, the upstream dependencies might take a while to filter down to typical user installs. We should work around it in the Vitess build, even if just in the interest of cleanliness.

[GuptaManan100]

If this issue is resolved, can we close this issue?