Remove C backend

Author: kmr-srbh

integration_tests/CMakeLists.txt

@@ -469,7 +469,7 @@ RUN(NAME print_list_tuple_01    LABELS cpython llvm llvm_jit c NOFAST)
 RUN(NAME print_list_tuple_02    LABELS cpython llvm llvm_jit c NOFAST)
 RUN(NAME print_list_tuple_03    LABELS cpython llvm llvm_jit c NOFAST)
 RUN(NAME test_list_item_mixed_print    LABELS cpython llvm llvm_jit c NOFAST)
-RUN(NAME test_intrinsic_function_mixed_print    LABELS cpython llvm llvm_jit c NOFAST)
+RUN(NAME test_intrinsic_function_mixed_print    LABELS cpython llvm llvm_jit NOFAST)
 
 # CPython and LLVM
 RUN(NAME const_01            LABELS cpython llvm llvm_jit c wasm)