Allow Synfig to build in C++11 mode.

Taken from here:
https://projects.archlinux.org/svntogit/community.git/plain/trunk/build-fix.patch?h=packages/synfig

diff -wbBur synfig-1.0-RC5/src/modules/mod_libavcodec/mptr.cpp synfig-1.0-RC5.my/src/modules/mod_libavcodec/mptr.cpp
--- synfig-1.0-RC5/src/modules/mod_libavcodec/mptr.cpp	2015-03-28 13:15:00.000000000 +0300
+++ synfig-1.0-RC5.my/src/modules/mod_libavcodec/mptr.cpp	2015-04-28 16:56:11.568749053 +0300
@@ -56,8 +56,8 @@
 /* === M E T H O D S ======================================================= */
 
 
-Importer_LibAVCodec::Importer_LibAVCodec(const char *file):
-	filename(file)
+Importer_LibAVCodec::Importer_LibAVCodec(const synfig::FileSystem::Identifier &identifier):
+	Importer(identifier)
 {
 }
 
diff -wbBur synfig-1.0-RC5/src/modules/mod_libavcodec/mptr.h synfig-1.0-RC5.my/src/modules/mod_libavcodec/mptr.h
--- synfig-1.0-RC5/src/modules/mod_libavcodec/mptr.h	2015-03-28 13:15:00.000000000 +0300
+++ synfig-1.0-RC5.my/src/modules/mod_libavcodec/mptr.h	2015-04-28 16:55:18.699192946 +0300
@@ -46,7 +46,7 @@
 	synfig::String filename;
 
 public:
-	Importer_LibAVCodec(const char *filename);
+	Importer_LibAVCodec(const synfig::FileSystem::Identifier &identifier);
 	~Importer_LibAVCodec();
 
 	virtual bool get_frame(synfig::Surface &surface, const synfig::RendDesc &renddesc, synfig::Time time, synfig::ProgressCallback *callback);
diff -wbBur synfig-1.0-RC5/src/modules/mod_libavcodec/trgt_av.cpp synfig-1.0-RC5.my/src/modules/mod_libavcodec/trgt_av.cpp
--- synfig-1.0-RC5/src/modules/mod_libavcodec/trgt_av.cpp	2015-03-28 13:15:00.000000000 +0300
+++ synfig-1.0-RC5.my/src/modules/mod_libavcodec/trgt_av.cpp	2015-04-28 16:46:54.720091106 +0300
@@ -121,14 +121,14 @@
     picture = avcodec_alloc_frame();
     if (!picture)
         return NULL;
-    size = avpicture_get_size(pix_fmt, width, height);
+    size = avpicture_get_size((::PixelFormat)pix_fmt, width, height);
     picture_buf = (uint8_t *)malloc(size);
     if (!picture_buf) {
         av_free(picture);
         return NULL;
     }
     avpicture_fill((AVPicture *)picture, picture_buf,
-                   pix_fmt, width, height);
+                   (::PixelFormat)pix_fmt, width, height);
     return picture;
 }
 
diff -wbBur synfig-1.0.2/src/synfig/time.cpp synfig-1.0.2.my/src/synfig/time.cpp
--- synfig-1.0.2/src/synfig/time.cpp	2015-07-09 10:33:03.000000000 +0300
+++ synfig-1.0.2.my/src/synfig/time.cpp	2015-10-12 13:54:58.382313903 +0300
@@ -319,5 +319,5 @@
 bool
 Time::is_valid()const
 {
-	return !isnan(value_);
+	return !::isnan(value_);
 }