Revert "glib2: fix host build"

There isn't prime time for it. Currently, it can not be built.
It fails with the following error:  ERROR: Compiler gcc can not compile programs.
More details in https://github.com/openwrt/packages/pull/11887 and
https://github.com/openwrt/packages/issues/11900

This reverts commit b62ed68007.

Signed-off-by: Josef Schlehofer <pepe.schlehofer@gmail.com>

libs/glib2/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=glib2
 PKG_VERSION:=2.64.2
-PKG_RELEASE:=2
+PKG_RELEASE:=1
 
 PKG_SOURCE:=glib-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=@GNOME/glib/2.64
@@ -42,7 +42,6 @@ define Package/glib2/description
   The GLib library of C routines
 endef
 
-HOST_LDFLAGS += -liconv
 TARGET_CFLAGS += -ffunction-sections -fdata-sections -flto
 TARGET_LDFLAGS += -Wl,--gc-sections