Force-disable icu4c use for now. To be revisited if Spotlight support
is reenabled.

Index: lib/util/charset/wscript_configure
--- lib/util/charset/wscript_configure.orig
+++ lib/util/charset/wscript_configure
@@ -37,7 +37,7 @@ conf.CHECK_CODE('''
                 lib='iconv',
                 headers='errno.h iconv.h')
 
-if conf.CHECK_CFG(package='icu-i18n',
+if False and conf.CHECK_CFG(package='icu-i18n',
                args='--cflags --libs',
                msg='Checking for icu-i18n',
                uselib_store='ICU_I18N'):