make it possible to keep usage texts in .c files

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/scripts/Makefile.IMA b/scripts/Makefile.IMA
index bddd702..11ae39e 100644
--- a/scripts/Makefile.IMA
+++ b/scripts/Makefile.IMA
@@ -200,7 +200,7 @@
 applets/applet_tables: include/autoconf.h
 	$(HOSTCC) -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -I$(srctree)/include -o applets/applet_tables applets/applet_tables.c
 
-include/usage_compressed.h: $(srctree)/include/usage.h applets/usage
+include/usage_compressed.h: include/usage.h applets/usage
 	$(srctree)/applets/usage_compressed include/usage_compressed.h applets
 
 include/applet_tables.h: include/applets.h