GCC 4.4 compatibility: explicit conversion operator-related issues.

src/Audio/Source.h

@@ -275,7 +275,7 @@ class MAGNUM_AUDIO_EXPORT Source {
          *      with @def_al{CONE_INNER_ANGLE}
          */
         Source& setInnerConeAngle(Deg angle) {
-            alSourcef(_id, AL_CONE_INNER_ANGLE, Float(angle));
+            alSourcef(_id, AL_CONE_INNER_ANGLE, angle.toUnderlyingType());
             return *this;
         }
 
@@ -290,7 +290,7 @@ class MAGNUM_AUDIO_EXPORT Source {
          *      @def_al{CONE_OUTER_ANGLE}
          */
         Source& setOuterConeAngle(Deg angle) {
-            alSourcef(_id, AL_CONE_OUTER_ANGLE, Float(angle));
+            alSourcef(_id, AL_CONE_OUTER_ANGLE, angle.toUnderlyingType());
             return *this;
         }