boost: replace zstd dependency with libzstd

libzstd is the correct one.

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

libs/boost/Makefile

@@ -13,7 +13,7 @@ include $(TOPDIR)/rules.mk
 PKG_NAME:=boost
 PKG_VERSION:=1.74.0
 PKG_SOURCE_VERSION:=1_74_0
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PKG_SOURCE:=$(PKG_NAME)_$(PKG_SOURCE_VERSION).tar.bz2
 PKG_SOURCE_URL:=@SF/$(PKG_NAME)/$(PKG_NAME)/$(PKG_VERSION) https://dl.bintray.com/boostorg/release/$(PKG_VERSION)/source/
@@ -336,7 +336,7 @@ $(eval $(call DefineBoostLibrary,date_time))
 $(eval $(call DefineBoostLibrary,fiber,coroutine filesystem,,!boost-fiber-exclude))
 $(eval $(call DefineBoostLibrary,filesystem,system))
 $(eval $(call DefineBoostLibrary,graph,regex))
-$(eval $(call DefineBoostLibrary,iostreams,,+zlib +liblzma +libbz2 +zstd))
+$(eval $(call DefineBoostLibrary,iostreams,,+zlib +liblzma +libbz2 +libzstd))
 $(eval $(call DefineBoostLibrary,locale,system,$(ICONV_DEPENDS),BUILD_NLS))
 $(eval $(call DefineBoostLibrary,log,system chrono date_time thread filesystem regex))
 $(eval $(call DefineBoostLibrary,math))