Revert "Makefile: Set CGO_CFLAGS dynamically on Mac OS X"

This reverts commit 6cde768.

Author: tchap

Makefile

@@ -72,17 +72,6 @@ image-ocp-deployer: image-ocp-cli
 $(call build-image,ocp-recycler,$(IMAGE_REGISTRY)/ocp/4.2:recycler,./images/recycler/Dockerfile.rhel,.)
 image-ocp-recycler: image-ocp-cli
 
-# macOS system GSSAPI headers lack RFC 5587 types (gss_const_name_t).
-# Use Homebrew's heimdal headers when available.
-ifeq ($(shell uname),Darwin)
-ifneq (,$(shell command -v brew 2>/dev/null))
-HEIMDAL_PREFIX := $(shell brew --prefix heimdal 2>/dev/null)
-ifneq (,$(HEIMDAL_PREFIX))
-export CGO_CFLAGS := $(CGO_CFLAGS) -I$(HEIMDAL_PREFIX)/include
-endif
-endif
-endif
-
 oc: GO_BUILD_PACKAGES :=./cmd/oc
 oc: build
 .PHONY: oc