[gnome-flashback] system-indicators: link with math library

[Alberts Muktupāvels <muktupavels src gnome org>]

commit afc77b61b952a00717ed55bbb80ab903cd061376
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Tue Feb 11 16:58:06 2020 +0200

    system-indicators: link with math library

 system-indicators/Makefile.am | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/system-indicators/Makefile.am b/system-indicators/Makefile.am
index 2806e62..54737e1 100644
--- a/system-indicators/Makefile.am
+++ b/system-indicators/Makefile.am
@@ -42,6 +42,7 @@ system_indicators_la_LIBADD = \
        $(top_builddir)/dbus/libdbus.la \
        $(top_builddir)/gvc/libgvc.la \
        $(SYSTEM_INDICATORS_LIBS) \
+       $(LIBM) \
        $(NULL)
 
 system_indicators_la_LDFLAGS = \