Merge commit 'bf2f748f'

* commit 'bf2f748f':
  configure: Use correct libm linker flag during math function checks
Merged-by: James Almer <jamrial@gmail.com>

configure

@@ -5744,7 +5744,7 @@ ldexpf_args=2
 powf_args=2
 
 for func in $MATH_FUNCS; do
-    eval check_mathfunc $func \${${func}_args:-1}
+    eval check_mathfunc $func \${${func}_args:-1} $LIBM
 done
 
 for func in $COMPLEX_FUNCS; do