cdparanoia: check for cdparanoia with pkg-config first

cdparanoia now has a .pc file in post-0.10.2 SVN, so use
that to check for cdparanoia before we try all the other
checks. Besides being generally nicer, this may help with
correctly detecting cdparanoia on OSX some day (see #609918).

configure.ac

@@ -584,8 +584,12 @@ AG_GST_CHECK_FEATURE(ALSA, [ALSA], alsa, [
 ])
 
 dnl *** CDParanoia ***
+dnl Note: upstream has a pkg-config file only in post-10.2 SVN so far
 translit(dnm, m, l) AM_CONDITIONAL(USE_CDPARANOIA, true)
 AG_GST_CHECK_FEATURE(CDPARANOIA, [CDParanoia], cdparanoia, [
+  PKG_CHECK_MODULES(CDPARANOIA, cdparanoia-3 >= 10.2, [
+    HAVE_CDPARANOIA="yes"
+  ], [
     AG_GST_CHECK_LIBHEADER(CDPARANOIA, cdda_interface, 
                         cdda_open, -lm, 
                         cdda_interface.h, 
@@ -616,6 +620,7 @@ AG_GST_CHECK_FEATURE(CDPARANOIA, [CDParanoia], cdparanoia, [
     fi
 
     AC_SUBST(CDPARANOIA_LIBS)
+  ])
 ])
 dnl FIXME : add second check somehow if that is necessary
 dnl AC_CHECK_LIB(cdda_paranoia, paranoia_init, : , HAVE_CDPARANOIA=no, -lcdda_interface )

ext/cdparanoia/Makefile.am

@@ -1,7 +1,11 @@
 plugin_LTLIBRARIES = libgstcdparanoia.la
 
 libgstcdparanoia_la_SOURCES = gstcdparanoiasrc.c
-libgstcdparanoia_la_CFLAGS = $(GST_PLUGINS_BASE_CFLAGS) $(GST_BASE_CFLAGS) $(GST_CFLAGS)
+libgstcdparanoia_la_CFLAGS = \
+	$(GST_PLUGINS_BASE_CFLAGS) \
+	$(GST_BASE_CFLAGS) \
+	$(GST_CFLAGS) \
+	$(CDPARANOIA_CFLAGS)
 libgstcdparanoia_la_LIBADD = \
 	$(top_builddir)/gst-libs/gst/cdda/libgstcdda-$(GST_MAJORMINOR).la \
 	$(GST_BASE_LIBS) \