Revert "Enable 64-bit builds of all host LLVM tools."

This reverts commit f514d2c2.

Change-Id: I240b55287c4c8a812b95b950a9a928f3e36628c5

llvm-host-build.mk

@@ -53,12 +53,13 @@ LOCAL_C_INCLUDES :=	\
 
 # Add on ncurses to have support for terminfo
 ifneq ($(HOST_OS),windows)
-LOCAL_LDLIBS += -lncurses \
-                -lgcc_s
+LOCAL_LDLIBS += -lncurses
 endif
 
 LOCAL_IS_HOST_MODULE := true
 
+LOCAL_32_BIT_ONLY := true
+
 ###########################################################
 ## Commands for running tblgen to compile a td file
 ###########################################################