Refs #247. Included lapack source codes. Avoid downloading tar.gz from netlib.org

Based on 3.4.2 version, apply patch.for_lapack-3.4.2.

lapack-netlib/BLAS/SRC/crotg.f

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+*> \brief \b CROTG
+*
+*  =========== DOCUMENTATION ===========
+*
+* Online html documentation available at 
+*            http://www.netlib.org/lapack/explore-html/ 
+*
+*  Definition:
+*  ===========
+*
+*       SUBROUTINE CROTG(CA,CB,C,S)
+* 
+*       .. Scalar Arguments ..
+*       COMPLEX CA,CB,S
+*       REAL C
+*       ..
+*  
+*
+*> \par Purpose:
+*  =============
+*>
+*> \verbatim
+*>
+*> CROTG determines a complex Givens rotation.
+*> \endverbatim
+*
+*  Authors:
+*  ========
+*
+*> \author Univ. of Tennessee 
+*> \author Univ. of California Berkeley 
+*> \author Univ. of Colorado Denver 
+*> \author NAG Ltd. 
+*
+*> \date November 2011
+*
+*> \ingroup complex_blas_level1
+*
+*  =====================================================================
+      SUBROUTINE CROTG(CA,CB,C,S)
+*
+*  -- Reference BLAS level1 routine (version 3.4.0) --
+*  -- Reference BLAS is a software package provided by Univ. of Tennessee,    --
+*  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
+*     November 2011
+*
+*     .. Scalar Arguments ..
+      COMPLEX CA,CB,S
+      REAL C
+*     ..
+*
+*  =====================================================================
+*
+*     .. Local Scalars ..
+      COMPLEX ALPHA
+      REAL NORM,SCALE
+*     ..
+*     .. Intrinsic Functions ..
+      INTRINSIC CABS,CONJG,SQRT
+*     ..
+      IF (CABS(CA).EQ.0.) THEN
+         C = 0.
+         S = (1.,0.)
+         CA = CB
+      ELSE
+         SCALE = CABS(CA) + CABS(CB)
+         NORM = SCALE*SQRT((CABS(CA/SCALE))**2+ (CABS(CB/SCALE))**2)
+         ALPHA = CA/CABS(CA)
+         C = CABS(CA)/NORM
+         S = ALPHA*CONJG(CB)/NORM
+         CA = ALPHA*NORM
+      END IF
+      RETURN
+      END