builder: fix 32bit mac build

Compile libicu not in cross mode for 32 bit.

Signed-off-by: Rafael Kitover <rkitover@gmail.com>

tools/osx/builder

@@ -90,6 +90,8 @@ if [ "$target_cpu" = i386 ]; then
     table_line_append DIST_PRE_BUILD sfml " \
         sed -i.bak '/FATAL_ERROR \"Only 64-bit architecture is supported/d' CMakeLists.txt; \
     "
+
+    table_line_append DIST_ARGS libicu '--host= --build='
 fi
 
 table_line_replace DIST_CONFIGURE_TYPES libmodplug autoreconf