[librsvg] Makefile.am: Oops, add rust/build.rs to the sources

[Federico Mena Quintero <federico src gnome org>]

commit a90065a189370fce2cae6051b5000f270f34ad0c
Author: Federico Mena Quintero <federico gnome org>
Date:   Fri Jul 14 11:34:43 2017 -0500

    Makefile.am: Oops, add rust/build.rs to the sources

 Makefile.am |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index cc2848b..544be5d 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -69,6 +69,7 @@ librsvg_@RSVG_API_MAJOR_VERSION@_la_SOURCES = \
        $(NULL)
 
 RUST_SOURCES =                                 \
+       rust/build.rs                           \
        rust/Cargo.toml                         \
        rust/src/aspect_ratio.rs                \
        rust/src/bbox.rs                        \