fix compiler warnings from MacOS

src/credentials.c

@@ -6,7 +6,7 @@
 
 #include "credentials.h"
 
-aws_crt_credentials_options *aws_crt_credentials_options_new() {
+aws_crt_credentials_options *aws_crt_credentials_options_new(void) {
     return aws_crt_resource_new(sizeof(aws_crt_credentials_options));
 }
 

src/credentials_providers.c

@@ -65,7 +65,7 @@ aws_crt_credentials_provider *aws_crt_credentials_provider_static_new(
     return provider;
 }
 
-aws_crt_credentials_provider_environment_options *aws_crt_credentials_provider_environment_options_new() {
+aws_crt_credentials_provider_environment_options *aws_crt_credentials_provider_environment_options_new(void) {
     return aws_crt_resource_new(sizeof(aws_crt_credentials_provider_environment_options));
 }
 
@@ -81,7 +81,7 @@ aws_crt_credentials_provider *aws_crt_credentials_provider_environment_new(
     return provider;
 }
 
-aws_crt_credentials_provider_profile_options *aws_crt_credentials_provider_profile_options_new() {
+aws_crt_credentials_provider_profile_options *aws_crt_credentials_provider_profile_options_new(void) {
     return aws_crt_resource_new(sizeof(aws_crt_credentials_provider_profile_options));
 }
 

src/event_loop_group.c

@@ -16,7 +16,7 @@ struct _aws_crt_event_loop_group {
     struct aws_event_loop_group *elg;
 };
 
-aws_crt_event_loop_group_options *aws_crt_event_loop_group_options_new() {
+aws_crt_event_loop_group_options *aws_crt_event_loop_group_options_new(void) {
     return aws_crt_resource_new(sizeof(aws_crt_event_loop_group_options));
 }
 

src/input_stream.c

@@ -7,7 +7,7 @@
 
 #include "input_stream.h"
 
-aws_crt_input_stream_options *aws_crt_input_stream_options_new() {
+aws_crt_input_stream_options *aws_crt_input_stream_options_new(void) {
     aws_crt_input_stream_options *options = aws_crt_resource_new(sizeof(aws_crt_input_stream_options));
     return options;
 }