chore: fix FORTRAN errors

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---

Author: Shabareesh Shetty

lib/node_modules/@stdlib/blas/base/zaxpy/src/zaxpy.f

@@ -57,12 +57,8 @@
 subroutine zaxpy( N, alpha, x, strideX, y, strideY )
   implicit none
   ! ..
-  ! External functions:
-  interface
-    subroutine dcabs1( z )
-      complex(kind=kind(0.0d0)) :: z
-    end subroutine dcabs1
-  end interface
+  ! Intrinsic functions:
+  intrinsic dcabs1
   ! ..
   ! Scalar arguments:
   complex(kind=kind(0.0d0)) :: alpha