syscall: Add mlock, munlock, mlockall, munlockall and mprotect to OSX

[worr]

What steps will reproduce the problem?
If possible, include a link to a program on play.golang.org.
1. Write code that uses one of the listed functions
2. Compile

What is the expected output?
It compiles and runs without issue

What do you see instead?
Symbols not found

Which operating system are you using?
OSX 10.7

Which version are you using?  (run 'go version' or 'gccgo --version')
1.2

Please provide any additional information below.
Here's a patch!
https://golang.org/cl/68980043

[robpike]

Comment 1:

To add to the libraries, discuss the change on the mailing list (not here) before
sending a patch, and follow the contribution guidelines at
http://golang.org/doc/contribute.html

Status changed to Invalid.

[bradfitz]

Comment 2:

This is a valid bug report / feature request by itself.  If it hadn't included a patch,
we wouldn't have marked this as Invalid.

Labels changed: added repo-main, release-go1.3maybe.

Status changed to Accepted.

[worr]

Comment 3:

I'll tidy up the patch and resubmit after I get home from work.

[bradfitz]

Comment 4:

This issue was closed by revision 08706f1.

Status changed to Fixed.