golang: Update to 1.15.4

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:=3
+GO_VERSION_PATCH:=4
 
 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:=896a602570e54c8cdfc2c1348abd4ffd1016758d0bd086ccd9787dbfc9b64888
+PKG_HASH:=063da6a9a4186b8118a0e584532c8c94e65582e2cd951ed078bfd595d27d2367
 
 PKG_MAINTAINER:=Jeffery To <jeffery.to@gmail.com>
 PKG_LICENSE:=BSD-3-Clause