Fixes for making libcdio work with pkg-config on Darwin when linking

vcdimager and when linking just libcdio. From Steven M. Schultz:

  I blew a couple minutes tinkering with libcdio.pc and found that
  manually adding a quote character (not even a matched set of quotes!)
  around the second -framework was enough.

  What works for now is manually editing libcdio.pc after it's been
  installed:

   Libs: -L${libdir} -lcdio  -lm  -Wl,-framework -Wl,CoreFoundation -Wl,-framework -Wl,IOKit

  to:

   Libs: -L${libdir} -lcdio  -lm  -Wl,-framework -Wl,CoreFoundation "-Wl,-framework" -Wl,IOKit

  is enough to get vcdimager compiled and linked.

  Appears that the thing to do is somehow get the quotes into
  libcdio.pc but not into $LIBS - or something like that at any rate.

configure.ac

@@ -19,7 +19,7 @@ define(RELEASE_NUM, 70)
 define(CDIO_VERSION_STR, 0.$1cvs)
 
 AC_PREREQ(2.52)
-AC_REVISION([$Id: configure.ac,v 1.90 2004/06/27 16:25:16 rocky Exp $])dnl
+AC_REVISION([$Id: configure.ac,v 1.91 2004/08/19 01:12:27 rocky Exp $])dnl
 AC_INIT(libcdio, CDIO_VERSION_STR(RELEASE_NUM))
 AC_CONFIG_SRCDIR(src/cd-info.c)
 AM_INIT_AUTOMAKE
@@ -237,7 +237,8 @@ case $host_os in
        if test "x$have_iokit_h" = "xyes" ; then 
          AC_DEFINE([HAVE_DARWIN_CDROM], [1],
 	      [Define 1 if you have Darwin OS X-type CD-ROM support])
-         LIBS="$LIBS  -Wl,-framework -Wl,CoreFoundation -Wl,\\\"-framework\\\" -Wl,IOKit"
+         LIBS="$LIBS  -Wl,-framework -Wl,CoreFoundation"
+	 DARWIN_PKG_LIB_HACK="\"-Wl,-framework\" -Wl,IOKit"
          cd_drivers="${cd_drivers}, Darwin"
        fi
      ;;
@@ -299,6 +300,7 @@ int has_timeout=sizeof(test.timeout);],
 	;;
 esac
 AC_SUBST(LINUX_CDROM_TIMEOUT)
+AC_SUBST(DARWIN_PKG_LIB_HACK)
 AC_SUBST(HAVE_BSDI_CDROM)
 AC_SUBST(HAVE_DARWIN_CDROM)
 AC_SUBST(HAVE_FREEBSD_CDROM)

libcdio.pc.in

@@ -7,5 +7,5 @@ Name: libcdio
 Description: Portable CD-ROM I/O library
 Version: @VERSION@
 #Requires: glib-2.0 
-Libs: -L${libdir} -lcdio @LIBS@
+Libs: -L${libdir} -lcdio @LIBS@ @DARWIN_PKG_LIB_HACK@
 Cflags: -I${includedir}