icu: speed up host build

The host build of icu doesn't need to build everything, so we can add
a few more --disable-<foo> options to save a little bit of build time.

On a fast build server, this bring the host icu build from 2m28.517s
to 2m5.192s.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/icu/icu.mk

@@ -15,7 +15,12 @@ ICU_INSTALL_STAGING = YES
 ICU_CONFIG_SCRIPTS = icu-config
 ICU_CONF_OPT = --with-cross-build=$(HOST_ICU_DIR)/source --disable-samples \
 		--disable-tests
-HOST_ICU_CONF_OPT = --disable-samples --disable-tests
+HOST_ICU_CONF_OPT = \
+	--disable-samples \
+	--disable-tests \
+	--disable-extras \
+	--disable-icuio \
+	--disable-layout
 ICU_MAKE = $(MAKE1)
 ICU_SUBDIR = source
 HOST_ICU_SUBDIR = source