Remove unnecessary extern "C" { ... } wrapping

[branbick]

Remove the extern "C" { ... } wrapping (and preceding comment). It's unnecessary because name-mangling is already prevented via preprocessor directives listed in src/init_from_input_file.h itself.

init-from-input-file/test/init_from_input_file/non_static_fxns/init_from_input_file_non_static_fxns_test.cpp

Lines 1 to 5 in a3a5f63

	// Prevent the C++ compiler from name-mangling the C code
	extern "C" {
	#include "../../../src/init_from_input_file.h"
	}