[Bug 196780] [patch] unbreak graphics/libspiro build on FreeBSD 8

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196780

            Bug ID: 196780
           Summary: [patch] unbreak graphics/libspiro build on FreeBSD 8
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: truckman at FreeBSD.org
                CC: cyberbotx at cyberbotx.com
                CC: cyberbotx at cyberbotx.com
             Flags: maintainer-feedback?(cyberbotx at cyberbotx.com)

Created attachment 151700
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=151700&action=edit
patch to unbreak graphics/libspiro build on FreeBSD 8

Building graphics/libspiro on FreeBSD 8 fails with the following error:

[snip]
gmake[2]: Entering directory
'/wrkdirs/usr/ports/graphics/libspiro/work/fontforge-libspiro-15fdb23'
  CC       spiro.lo
  CC       spiroentrypoints.lo
  CC       bezctx.lo
  CCLD     libspiro.la
libtool:   error: CURRENT '' must be a nonnegative integer
libtool:   error: ':2:0' is not valid version information
Makefile:495: recipe for target 'libspiro.la' failed
gmake[2]: *** [libspiro.la] Error 1

Looking around for 2:0 ...
# grep '2:0' *
Makefile:LIBSPIRO_VERSION = $0:2:0
config.log:LIBSPIRO_VERSION='$0:2:0'
config.status:S["LIBSPIRO_VERSION"]="$0:2:0"

which is obviously bogus.

The origin is a typo in configure.ac:
#-------------------------------------------
# Pass variables to MAKEFILE.AM
AC_SUBST(HOST,$host)
AC_SUBST(LIBSPIRO_VERSION,$spiro_info)

This is incorrect because spiro_info is an m4 variable, so the $ gets
prepended to its value when generating Makefile.  The Makefile than uses
LIBSPIRO_VERSION here:
libspiro_la_LDFLAGS = $(AM_LDFLAGS) -version-info $(LIBSPIRO_VERSION).
The shell then sees $0:2:0 and chokes.

FreeBSD 9 and newer are able to build the port because their version of /bin/sh
has been patched in a way that allows them to accept this as input.

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