[metacity] use LT_LIB_M to find the math library

[Alberts Muktupāvels <muktupavels src gnome org>]

commit d0e9afed4cbd8f738a32f30682590bf91ee46c96
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Wed Sep 30 20:47:29 2015 +0300

    use LT_LIB_M to find the math library

 configure.ac          |    5 +++--
 src/tools/Makefile.am |    2 +-
 2 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index a26ea7a..dc44eb4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -55,6 +55,7 @@ dnl Initialize libtool
 dnl **************************************************************************
 
 LT_INIT
+LT_LIB_M
 
 # Honor aclocal flags
 AC_SUBST(ACLOCAL_AMFLAGS, "\${ACLOCAL_FLAGS}")
@@ -350,9 +351,9 @@ if test "x$found_randr" = "xyes"; then
    AC_DEFINE(HAVE_RANDR, , [Have the Xrandr extension library])
 fi
 
-METACITY_LIBS="$ALL_LIBS $METACITY_LIBS $RANDR_LIBS -lX11 -lXext $X_EXTRA_LIBS -lm"
+METACITY_LIBS="$ALL_LIBS $METACITY_LIBS $RANDR_LIBS -lX11 -lXext $X_EXTRA_LIBS $LIBM"
 METACITY_MESSAGE_LIBS="$METACITY_MESSAGE_LIBS -lX11 $X_EXTRA_LIBS"
-METACITY_WINDOW_DEMO_LIBS="$METACITY_WINDOW_DEMO_LIBS -lX11 $X_EXTRA_LIBS"
+METACITY_WINDOW_DEMO_LIBS="$METACITY_WINDOW_DEMO_LIBS -lX11 $X_EXTRA_LIBS $LIBM"
 METACITY_PROPS_LIBS="$METACITY_PROPS_LIBS -lX11 $X_EXTRA_LIBS"
 
 found_sm=no
diff --git a/src/tools/Makefile.am b/src/tools/Makefile.am
index 3ac594f..5251006 100644
--- a/src/tools/Makefile.am
+++ b/src/tools/Makefile.am
@@ -26,7 +26,7 @@ noinst_PROGRAMS=metacity-mag metacity-grayscale
 
 metacity_message_LDADD= @METACITY_MESSAGE_LIBS@
 metacity_window_demo_LDADD= @METACITY_WINDOW_DEMO_LIBS@
-metacity_mag_LDADD= @METACITY_WINDOW_DEMO_LIBS@ -lm
+metacity_mag_LDADD= @METACITY_WINDOW_DEMO_LIBS@
 metacity_grayscale_LDADD = @METACITY_WINDOW_DEMO_LIBS@
 
 EXTRA_DIST=$(icon_DATA)