Better exit handling of updateLayer; clean builds for a 10.9 target o… #560

Job	Run time
build (gcc)	1m 38s
build (gcc, CFLAGS=-DTK_NO_DEPRECATED=1)	1m 52s
test (gcc)	4m 4s
build (gcc, --disable-shared)	2m 8s
test (gcc, --disable-xft)	4m 4s
build (gcc, --disable-xft)	1m 38s
test (gcc, --enable-symbols)	3m 30s
build (gcc, --disable-xss)	1m 49s
build (gcc, --enable-symbols)	1m 11s
build (clang)	2m 14s
build (clang, CFLAGS=-DTK_NO_DEPRECATED=1)	1m 54s
build (clang, --disable-shared)	1m 51s
build (clang, --disable-xft)	1m 49s
build (clang, --disable-xss)	1m 51s
build (clang, --enable-symbols)	1m 44s
	33m 17s

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