Workaround for clang bug that prevents importing string and iostream

Described here
llvm/llvm-project#58540
https://stackoverflow.com/questions/74149849/error-when-importing-string-and-iostream-in-same-file?noredirect=1#comment130924685_74149849

src/glapi.cppm

@@ -2,12 +2,11 @@ module;
 
 #include <GL/gl.h>
 #include <SDL2/SDL_video.h>
-#include <stdexcept>
 
 export module glapi;
 
 import <stdexcept>;
-import <string>;
+import <iostream>;
 
 #define glCall(call)                                                           \
     call;                                                                      \

src/glfunctions.h

@@ -38,7 +38,6 @@
 #endif
 
 #include <stdexcept>
-#include <string>
 #define glCall(call)                                                           \
     call;                                                                      \
     checkGlError(#call)

src/main-nix.cpp

@@ -1,18 +1,13 @@
-
-
-// #include "glfunctions.h"
 #include <GL/gl.h>
 #include <SDL2/SDL.h>
-// #include <cstdio>
 
 import graf;
 import draw;
 import hant;
 import graf;
 import glapi;
 
-// import <cstdlib>;
-// import <iostream>;
+import <iostream>;
 import <stdexcept>;
 
 using namespace std;
@@ -85,7 +80,7 @@ void processEvents() {
 // Init everything
 int main(int /*argc*/, char * /*argv*/[]) {
     if (SDL_Init(SDL_INIT_VIDEO)) {
-        fprintf(stderr, "&s", "failed to init video\n");
+        std::cerr << "failed to init video\n";
         return -1;
     }
     SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
@@ -104,7 +99,7 @@ int main(int /*argc*/, char * /*argv*/[]) {
                               height,
                               SDL_WINDOW_OPENGL);
     if (!window) {
-        fprintf(stderr, "%s", "could not create window\n");
+        std::cerr << "could not create window\n";
         return 1;
     }
 

src/matgl.cppm

@@ -16,13 +16,12 @@ module;
 #include <GL/gl.h>
 #include <GL/glext.h>
 #include <SDL2/SDL.h>
-// #include <iostream>
-#include <stdexcept>
-#include <vector>
 
 export module matgl;
 
 import glapi;
+import <stdexcept>;
+import <vector>;
 
 export namespace GL {