[file-roller] Fix libm linking

[Paolo Bacchilega <paobac src gnome org>]

commit 76b71a8e4956bc21ecc00d77c069650b3dda6a42
Author: Bastien Nocera <hadess hadess net>
Date:   Wed Feb 10 17:47:08 2010 +0000

    Fix libm linking
    
    Otherwise we fail to link against libm:
    /usr/bin/ld: dlg-batch-add.o: undefined reference to symbol 'floor@@GLIBC_2.2.5'
    /usr/bin/ld: note: 'floor@@GLIBC_2.2.5' is defined in DSO /lib64/libm.so.6 so try adding it to the linker command line
    /lib64/libm.so.6: could not read symbols: Invalid operation
    
    https://bugzilla.gnome.org/show_bug.cgi?id=609565

 configure.ac |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 9a0de5a..37bffc7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -91,6 +91,8 @@ AC_CHECK_FUNC(mkdtemp,
     mkdtemp_missing=true)
 AM_CONDITIONAL(MKDTEMP_MISSING, test x$mkdtemp_missing = xtrue)
 
+AC_CHECK_LIB(m, floor)
+
 dnl ==========================================================================
 
 AC_ARG_ENABLE(packagekit,