patch: make -p count path components, not slashes (think /blah//thing)

Signed-off-by: Rob Landley <rob@landley.net>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

testsuite/patch.tests

@@ -226,6 +226,22 @@ qwerty
 +qwerty
 "
 
+# testing "test name" "command(s)" "expected result" "file input" "stdin"
+testing "patch understands ...dir///dir..." \
+	'patch -p1 2>&1; echo $?' \
+"\
+patching file dir2///file
+patch: can't open 'dir2///file': No such file or directory
+1
+" "" "\
+--- bogus_dir///dir2///file
++++ bogus_dir///dir2///file
+@@ -1,2 +1,3 @@
+ qwe
++asd
+ zxc
+"
+
 rm input.orig 2>/dev/null
 
 exit $FAILCOUNT