Update stdlib_math.fypp. Remove pure attribute.

Author: MilanSkocic

src/stdlib_math.fypp

@@ -474,14 +474,14 @@ contains
     #:endfor
 
     #:for k1, t1 in REAL_KINDS_TYPES
-    pure elemental function deg2rad_${k1}$(theta)result(result)
+    elemental function deg2rad_${k1}$(theta)result(result)
         ${t1}$, intent(in) :: theta
         ${t1}$ :: result
         result = theta * PI_${k1}$ / 180.0_${k1}$
 
     end function deg2rad_${k1}$
 
-    pure elemental function rad2deg_${k1}$(theta)result(result)
+    elemental function rad2deg_${k1}$(theta)result(result)
         ${t1}$, intent(in) :: theta
         ${t1}$ :: result
         result = theta * 180.0_${k1}$ / PI_${k1}$