Moving stdlib.h include outside of imgui.h (#405)

examples/opengl3_example/main.cpp

@@ -16,7 +16,7 @@ int main(int, char**)
     // Setup window
     glfwSetErrorCallback(error_callback);
     if (!glfwInit())
-        exit(1);
+        return 1;
     glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
     glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
     glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);

examples/opengl_example/main.cpp

@@ -15,7 +15,7 @@ int main(int, char**)
     // Setup window
     glfwSetErrorCallback(error_callback);
     if (!glfwInit())
-        exit(1);
+        return 1;
     GLFWwindow* window = glfwCreateWindow(1280, 720, "ImGui OpenGL2 example", NULL, NULL);
     glfwMakeContextCurrent(window);
 

imgui.cpp

@@ -512,6 +512,7 @@
 
 #include <ctype.h>      // toupper, isprint
 #include <math.h>       // sqrtf, fabsf, fmodf, powf, cosf, sinf, floorf, ceilf
+#include <stdlib.h>     // NULL, malloc, free, qsort, atoi
 #include <stdio.h>      // vsnprintf, sscanf, printf
 #include <new>          // new (ptr)
 #if defined(_MSC_VER) && _MSC_VER <= 1500 // MSVC 2008 or earlier

imgui.h

@@ -14,7 +14,6 @@
 #include <float.h>          // FLT_MAX
 #include <stdarg.h>         // va_list
 #include <stddef.h>         // ptrdiff_t, NULL
-#include <stdlib.h>         // NULL, malloc, free, qsort, atoi
 #include <string.h>         // memset, memmove, memcpy, strlen, strchr, strcpy, strcmp
 
 #define IMGUI_VERSION       "1.47 WIP"

imgui_demo.cpp

@@ -10,9 +10,10 @@
 #endif
 
 #include "imgui.h"
-#include <ctype.h>              // toupper, isprint
-#include <math.h>               // sqrtf, fabsf, fmodf, powf, cosf, sinf, floorf, ceilf
-#include <stdio.h>              // vsnprintf, sscanf, printf
+#include <ctype.h>          // toupper, isprint
+#include <math.h>           // sqrtf, fabsf, fmodf, powf, cosf, sinf, floorf, ceilf
+#include <stdio.h>          // vsnprintf, sscanf, printf
+#include <stdlib.h>         // NULL, malloc, free, qsort, atoi
 
 #ifdef _MSC_VER
 #pragma warning (disable: 4996) // 'This function or variable may be unsafe': strcpy, strdup, sprintf, vsnprintf, sscanf, fopen