Remove some float-functions ambiguities.

diff -r b5ca3e646c88 liboctave/ChangeLog
--- a/liboctave/ChangeLog	Thu Jun 12 10:42:26 2008 +0200
+++ b/liboctave/ChangeLog	Fri Jun 13 16:34:35 2008 +0200
@@ -1,3 +1,7 @@
+2008-06-13  Michael Goffioul  <michael.goffioul@gmail.com>
+
+	* lo-mappers.cc: remove ambiguity about atan2(float,float) usage.
+
 2008-06-05  John W. Eaton  <jwe@octave.org>
 
 	* oct-shlib.cc (octave_base_shlib::remove): Only dereference
diff -r b5ca3e646c88 liboctave/fCmplxDET.cc
--- a/liboctave/fCmplxDET.cc	Thu Jun 12 10:42:26 2008 +0200
+++ b/liboctave/fCmplxDET.cc	Fri Jun 13 16:34:35 2008 +0200
@@ -57,7 +57,7 @@
       float etmp = e2 / xlog2 (static_cast<float>(10));
       e10 = static_cast<int> (xround (etmp));
       etmp -= e10;
-      c10 = c2 * static_cast<float> (pow (10.0, etmp));
+      c10 = c2 * static_cast<float> (pow (10.0f, etmp));
     }
 }
 
diff -r b5ca3e646c88 liboctave/lo-mappers.cc
--- a/liboctave/lo-mappers.cc	Thu Jun 12 10:42:26 2008 +0200
+++ b/liboctave/lo-mappers.cc	Fri Jun 13 16:34:35 2008 +0200
@@ -402,7 +402,7 @@
 float
 arg (float x)
 {
-  return atan2 (0.0, x);
+  return atan2 (0.0f, x);
 }
 
 float