golang: Update to 1.15.7

This includes fixes for:
* CVE-2021-3114: crypto/elliptic: incorrect operations on the P-224
  curve
* CVE-2021-3115: cmd/go: packages using cgo can cause arbitrary code
  execution on Windows

Signed-off-by: Jeffery To <jeffery.to@gmail.com>

lang/golang/golang/Makefile

@@ -8,7 +8,7 @@
 include $(TOPDIR)/rules.mk
 
 GO_VERSION_MAJOR_MINOR:=1.15
-GO_VERSION_PATCH:=6
+GO_VERSION_PATCH:=7
 
 PKG_NAME:=golang
 PKG_VERSION:=$(GO_VERSION_MAJOR_MINOR)$(if $(GO_VERSION_PATCH),.$(GO_VERSION_PATCH))
@@ -20,7 +20,7 @@ GO_SOURCE_URLS:=https://dl.google.com/go/ \
 
 PKG_SOURCE:=go$(PKG_VERSION).src.tar.gz
 PKG_SOURCE_URL:=$(GO_SOURCE_URLS)
-PKG_HASH:=890bba73c5e2b19ffb1180e385ea225059eb008eb91b694875dd86ea48675817
+PKG_HASH:=8631b3aafd8ecb9244ec2ffb8a2a8b4983cf4ad15572b9801f7c5b167c1a2abc
 
 PKG_MAINTAINER:=Jeffery To <jeffery.to@gmail.com>
 PKG_LICENSE:=BSD-3-Clause