Move library code to lib/

Fixes accidental inclusion of test instrumentation into the all-in-one
script.

make-allinone.sh

@@ -8,6 +8,6 @@ echo "Outputting to $OUT" >&2
 shopt -s globstar
 "$WORKDIR/util/squash" \
     "$WORKDIR/simplify_static_dir-main.pl" \
-    "$WORKDIR"/**/*.pm \
+    "$WORKDIR"/lib/**/*.pm \
     > "$OUT"
 chmod +x -- "$OUT"

simplify_static_dir-main.pl

@@ -107,7 +107,7 @@ use Pod::Usage qw/ pod2usage /;
 # :squash-remove-start:
 # (this prepends to the load path)
 use FindBin qw//;
-use lib $FindBin::RealBin;
+use lib "$FindBin::RealBin/lib";
 
 require Directory::Simplify::File;
 require Directory::Simplify::FileHash;