Don't unset AWS_PROFILE in Makefile

It shouldn't impact the output, and it's the one that "many
people" (i.e. me) need to use!

Makefile

@@ -49,7 +49,7 @@ GCFLAGS?=
 MAKEDIR:=$(strip $(shell dirname "$(realpath $(lastword $(MAKEFILE_LIST)))"))
 
 # Unexport environment variables that can affect tests and are not used in builds
-unexport AWS_ACCESS_KEY_ID AWS_PROFILE AWS_REGION AWS_SECRET_ACCESS_KEY AWS_SESSION_TOKEN CNI_VERSION_URL DNS_IGNORE_NS_CHECK DNSCONTROLLER_IMAGE DO_ACCESS_TOKEN GOOGLE_APPLICATION_CREDENTIALS
+unexport AWS_ACCESS_KEY_ID AWS_REGION AWS_SECRET_ACCESS_KEY AWS_SESSION_TOKEN CNI_VERSION_URL DNS_IGNORE_NS_CHECK DNSCONTROLLER_IMAGE DO_ACCESS_TOKEN GOOGLE_APPLICATION_CREDENTIALS
 unexport KOPS_BASE_URL KOPS_CLUSTER_NAME KOPS_RUN_OBSOLETE_VERSION KOPS_STATE_STORE KOPS_STATE_S3_ACL KUBE_API_VERSIONS NODEUP_URL OPENSTACK_CREDENTIAL_FILE PROTOKUBE_IMAGE SKIP_PACKAGE_UPDATE
 unexport SKIP_REGION_CHECK S3_ACCESS_KEY_ID S3_ENDPOINT S3_REGION S3_SECRET_ACCESS_KEY VSPHERE_USERNAME VSPHERE_PASSWORD