Revert "libmstch: Remove boost dependency"

This reverts commit cb78291982.

The buildbots have GCC6. GCC7 is needed for C++17.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

libs/libmstch/Makefile

@@ -2,7 +2,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=libmstch
 PKG_VERSION:=1.0.2
-PKG_RELEASE:=3
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://codeload.github.com/no1msd/mstch/tar.gz/$(PKG_VERSION)?
@@ -14,6 +14,7 @@ PKG_MAINTAINER:=Amol Bhave <ambhave@fb.com>
 PKG_LICENSE:=MIT
 PKG_LICENSE_FILES:=LICENSE
 
+HOST_BUILD_DEPENDS:=boost/host
 PKG_BUILD_PARALLEL:=1
 CMAKE_INSTALL:=1
 
@@ -25,7 +26,7 @@ define Package/libmstch
 	SECTION:=libs
 	CATEGORY:=Libraries
 	TITLE:=Complete implementation of {{mustache}} templates using modern C++
-	DEPENDS:=+libstdcpp
+	DEPENDS:=+boost +boost-container
 	URL:=https://github.com/no1msd/mstch
 endef