[nautilus] build: Fix libm detection

[Carlos Soriano <csoriano src gnome org>]

commit 1358dc6beba43365572122d5c89347c2491d2b13
Author: Christophe Fergeau <cfergeau redhat com>
Date:   Sat Mar 24 13:08:57 2018 +0100

    build: Fix libm detection
    
    find_library expects the library name without the 'lib' prefix,
    otherwise it will be looking for "liblibm"

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index cd3006932..41782c261 100644
--- a/meson.build
+++ b/meson.build
@@ -67,7 +67,7 @@ libgd = subproject(
 )
 libgd_dep = libgd.get_variable('libgd_dep')
 
-libm = cc.find_library('libm')
+libm = cc.find_library('m')
 
 gail = dependency('gail-3.0')
 if get_option('extensions')