build: pass -fno-lto when building expat

Otherwise it's autoconf endianess check will fail to determine what the
endianess is..

Author: fanquake

depends/packages/expat.mk

@@ -9,6 +9,7 @@ define $(package)_set_vars
   $(package)_config_opts += --disable-dependency-tracking --enable-option-checking
   $(package)_config_opts += --without-xmlwf
   $(package)_config_opts_linux=--with-pic
+  $(package)_cflags += -fno-lto
 endef
 
 define $(package)_config_cmds