revert addition of MSVC-compatible complex (moved to lapacke_config.h)

lapack-netlib/LAPACKE/include/lapack.h

@@ -37,14 +37,7 @@
 */
 
 #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
 
-#else
 /* Complex type (single precision) */
 #ifndef lapack_complex_float
 #ifndef __cplusplus
@@ -81,7 +74,6 @@
 #define lapack_complex_double_imag(z)       (cimag(z))
 #endif
 
-#endif
 #endif /* LAPACK_COMPLEX_CUSTOM */