Add complex type definitions for MSVC

Author: martin-frbg

lapack-netlib/LAPACKE/include/lapack.h

@@ -37,7 +37,15 @@
 */
 
 #ifndef LAPACK_COMPLEX_CUSTOM
+#if defined(_MSC_VER)
+    #define _CRT_USE_C_COMPLEX_H
+    #include <complex.h>
+    #define LAPACK_COMPLEX_CUSTOM
+    #define lapack_complex_float _Fcomplex
+    #define lapack_complex_double _Dcomplex
+#endif
 
+#else
 /* Complex type (single precision) */
 #ifndef lapack_complex_float
 #ifndef __cplusplus
@@ -74,6 +82,7 @@
 #define lapack_complex_double_imag(z)       (cimag(z))
 #endif
 
+#endif
 #endif /* LAPACK_COMPLEX_CUSTOM */