Automatically disable FEATURE_COMPRESS_USAGE for small builds.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/applets/usage_compressed b/applets/usage_compressed
index 186fcde..36fc2a0 100755
--- a/applets/usage_compressed
+++ b/applets/usage_compressed
@@ -36,6 +36,9 @@
 #0000040 114 105 135 040 133 055 141 040 101 103 124 111 117 116 106 111
 #         042514 020135 026533 020141 041501 044524 047117 044506
 
+echo "#define UNPACKED_USAGE_LENGTH `$loc/usage | wc -c`"
+echo
+
 echo '#define PACKED_USAGE \'
 ## Breaks on big-endian systems!
 ## # Extra effort to avoid using "od -t x1": -t is not available