[metacity] libmetacity: link with math library

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 0ec72c75e3348cccedfb2f6adaf6aea899035f98
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Mon Feb 15 22:47:54 2016 +0200

    libmetacity: link with math library

 libmetacity/Makefile.am |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/libmetacity/Makefile.am b/libmetacity/Makefile.am
index e063d73..4fd809e 100644
--- a/libmetacity/Makefile.am
+++ b/libmetacity/Makefile.am
@@ -62,6 +62,7 @@ libmetacity_la_LDFLAGS = \
 
 libmetacity_la_LIBADD = \
        $(LIBMETACITY_LIBS) \
+       $(LIBM) \
        $(NULL)
 
 libmetacity_includedir = $(includedir)/metacity/libmetacity