Update Clang.jl generator scripts (#35)

gen/libpng/Project.toml

@@ -0,0 +1,6 @@
+[deps]
+Clang = "40e3b903-d033-50b4-a0cc-940c62c95e31"
+libpng_jll = "b53b4c65-9356-5827-b1ea-8c7a1a84506f"
+
+[compat]
+Clang = "0.14.0"

gen/libpng/generator.toml

@@ -0,0 +1,23 @@
+[general]
+library_name = "libpng"
+output_file_path = "libpng_api.jl"
+prologue_file_path = "prologue.jl"
+use_julia_native_enum_type = false
+print_using_CEnum = false
+use_deterministic_symbol = true
+is_local_header_only = true
+smart_de_anonymize = true
+printer_blacklist = [
+    "PNG_IDAT_READ_SIZE",
+    "PNG_RESTRICT",
+    "png_libpng_ver",
+    "PNG_UINT_32_MAX",
+    "PNG_SIZE_MAX"
+]
+[codegen]
+use_julia_bool = true
+always_NUL_terminated_string = true
+is_function_strictly_typed = false
+opaque_func_arg_as_PtrCvoid = false
+opaque_as_mutable_struct = false
+use_ccall_macro = false