Use complex types defined in lfortran_intrinsics

Author: Smit-create

src/libasr/codegen/asr_to_c_cpp.h

@@ -450,13 +450,13 @@ R"(#include <stdio.h>
                     if (gen_stdcomplex) {
                         sub = "std::complex<float> ";
                     } else {
-                        sub = "float complex ";
+                        sub = "float_complex_t ";
                     }
                 } else {
                     if (gen_stdcomplex) {
                         sub = "std::complex<double> ";
                     } else {
-                        sub = "double complex ";
+                        sub = "double_complex_t ";
                     }
                 }
             }

src/libasr/codegen/c_utils.h

@@ -314,13 +314,13 @@ namespace CUtils {
             case ASR::ttypeType::Complex: {
                 if( kind == 4 ) {
                     if( is_c ) {
-                        type_src = "float complex";
+                        type_src = "float_complex_t";
                     } else {
                         type_src = "std::complex<float>";
                     }
                 } else if( kind == 8 ) {
                     if( is_c ) {
-                        type_src = "double complex";
+                        type_src = "double_complex_t";
                     } else {
                         type_src = "std::complex<double>";
                     }