taglib: Add examples variant

See: https://trac.macports.org/ticket/53452

audio/taglib/Portfile

@@ -33,12 +33,26 @@ platform darwin 8 {
 cmake.out_of_source yes
 
 configure.args-append  ../${distname} \
-                       -DWITH_ASF=On -DWITH_MP4=On -DBUILD_SHARED_LIBS=On
+                    -DWITH_ASF=On \
+                    -DWITH_MP4=On \
+                    -DBUILD_SHARED_LIBS=On \
+                    -DBUILD_EXAMPLES=Off
 
 # asf and mp4 are necessary for Amarok.
 # Change to make them optional was reportedly political
 # http://lists.kde.org/?l=amarok&m=125338541922769&w=2
 
+variant examples description "Include example programs" {
+    configure.args-replace  -DBUILD_EXAMPLES=Off \
+                            -DBUILD_EXAMPLES=On
+
+    post-destroot {
+        xinstall -m 0755 -W ${build.dir}/examples \
+            tagreader tagwriter framelist strip-id3v1 \
+            ${destroot}${prefix}/bin/
+    }
+}
+
 variant tests description "Enable running tests" {
     depends_build-append    port:cppunit