This reverts commit 597df59d36d6b5a9e4bfec918053495d750fa2dd. Reverting the change since, runtime/cgo is still not buildable and CCFLAGS is not a valid env variable. See golang/go#11339 for more information. Change-Id: I2f168508d1ca72f5c75ff641938fd3b304939617 Reviewed-on: https://go-review.googlesource.com/11453 Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>