protobuf: fix PKG_HASH

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

libs/protobuf/Makefile

@@ -13,7 +13,7 @@ PKG_RELEASE:=1
 
 PKG_SOURCE:=$(PKG_NAME)-cpp-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://github.com/google/protobuf/releases/download/v$(PKG_VERSION)
-PKG_HASH:=5e2587dea2f9287885e3b04d3a94ed4e8b9b2d2c5dd1f0032ceef3ea1d153bd7
+PKG_HASH:=578a2589bf9258adb03245dec5d624b61536867ebb732dbb8aeb30d96b0ada1f
 
 PKG_LICENSE:=BSD-3-Clause
 PKG_LICENSE_FILES:=LICENSE