[Bug 296139] net/openmpi: Fix OMPIO sharedfp/sm crash on FreeBSD due to non-compliant named semaphore string

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=296139

            Bug ID: 296139
           Summary: net/openmpi: Fix OMPIO sharedfp/sm crash on FreeBSD
                    due to non-compliant named semaphore string
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: laurent@FreeBSD.org
          Reporter: rikka.goering@outlook.de
          Assignee: laurent@FreeBSD.org
             Flags: maintainer-feedback?(laurent@FreeBSD.org)

Created attachment 271926
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=271926&action=edit
net/openmpi: Fix OMPIO sharedfp/sm crash on FreeBSD due to non-compliant named
semaphore string

When utilizing OMPIO for parallel I/O operations on local filesystems, OpenMPI
defaults to the shared memory module (sharedfp/sm). Inside
sharedfp_sm_file_open.c, the framework constructs POSIX named semaphores using
the template "OMPIO_%s".

FreeBSD's sem_open(3) strictly enforces the POSIX standard requiring named
semaphores to begin with a leading forward slash ('/'). Because OpenMPI omits
the slash, sem_open fails with EINVAL, causing the entire runtime to abort with
MPI_ERR_OTHER (Error 16).

The attached patch adds the required leading slash ("/OMPIO_%s"), restoring
seamless out-of-the-box parallel I/O functionality (verifiable via standard
suites like Intel MPI Benchmarks).

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