uart/host: Don't try to build a 32bit binary

The host these days is typically a x86_64 machine without any i386
compatibility. Let's build whatever is native, don't use "-m32"

src/dialog/uart/host/Makefile

@@ -4,7 +4,7 @@ CONFIG_SHELL	:= $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 		    else if [ -x /bin/bash ]; then echo /bin/bash; \
 		    else echo sh; fi ; fi)
 
-HOSTCC		= gcc -m32
+HOSTCC		= gcc
 HOSTCFLAGS	= -Wall -Wstrict-prototypes -O2 
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