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Use glGenTextures() and glFramebufferTexture2D() everywhere instead of creating stubs; close #20

--- a/src/render_gl.c

+++ b/src/render_gl.c

@@ -3,10 +3,7 @@

 #if defined(__APPLE__) && defined(__MACH__)

 	#include <OpenGL/gl.h>

 	#include <OpenGL/glext.h>

-

-	void glCreateTextures(GLuint ignored, GLsizei n, GLuint *name) {

-		glGenTextures(1, name);

-	}

+	

 	#define glGenVertexArrays glGenVertexArraysAPPLE

 	#define glBindVertexArray glBindVertexArrayAPPLE

 	#define glDeleteVertexArrays glDeleteVertexArraysAPPLE

@@ -15,16 +12,6 @@

 #elif defined(__unix__)

 	#include <GL/glew.h>

-	#ifdef __EMSCRIPTEN__

-		void glCreateTextures(GLuint ignored, GLsizei n, GLuint *name) {

-			glGenTextures(1, name);

-		}

-

-		void glFramebufferTexture(GLenum target, GLenum attachment, GLuint texture, GLint level) {

-			glFramebufferTexture2D(target, attachment, GL_TEXTURE_2D, texture, level);

-		}

-	#endif

-

 // WINDOWS

 #else

 	#include <windows.h>

@@ -419,7 +406,7 @@

 	// Atlas Texture

-	glCreateTextures(GL_TEXTURE_2D, 1, &atlas_texture);

+	glGenTextures(1, &atlas_texture);

 	glBindTexture(GL_TEXTURE_2D, atlas_texture);

 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, RENDER_USE_MIPMAPS ? GL_LINEAR_MIPMAP_LINEAR : GL_LINEAR);

@@ -559,7 +546,7 @@

 	glBindFramebuffer(GL_FRAMEBUFFER, backbuffer);

 	glBindRenderbuffer(GL_RENDERBUFFER, backbuffer_depth_buffer);	

 	glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, backbuffer_depth_buffer);

-	glFramebufferTexture(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, backbuffer_texture, 0);

+	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, backbuffer_texture, 0);

 	glBindRenderbuffer(GL_RENDERBUFFER, backbuffer_depth_buffer);

 	glRenderbufferStorage(GL_RENDERBUFFER, RENDER_DEPTH_BUFFER_INTERNAL_FORMAT, backbuffer_size.x, backbuffer_size.y);