gcl is long deprecated, "git cl" is what this is used for now.

TBR: davidben
Change-Id: I5980b8ff3a7c384f4650e195eb6e4daf52da5ae2
Reviewed-on: https://boringssl-review.googlesource.com/30064
Reviewed-by: Ryan Tseng <hinoka@google.com>

Change-Id: I3ca064545892b3e7be6083355fe1814bab320035

Change-Id: Ifc785d76528f406860ecbed5cb1ea3f1251ad42a

Change-Id: If385f78b2d8103aac1a078cf9c5751d173878f8d

With this, `git cl upload` will do the right thing for boringssl.

BUG=none
Change-Id: Icc83144ef39bc71c795c411e608e0b8c009f3a04
Reviewed-on: https://boringssl-review.googlesource.com/2331
Reviewed-by: David Benjamin <davidben@chromium.org>
Reviewed-by: Adam Langley <agl@google.com>