opengles2: fix prototype of glDeleteBuffers

src/render/opengles2/SDL_gles2funcs.h

@@ -75,7 +75,7 @@ SDL_PROC(void, glDeleteFramebuffers, (GLsizei, const GLuint *))
 SDL_PROC(GLint, glGetAttribLocation, (GLuint, const GLchar *))
 SDL_PROC(void, glGetProgramInfoLog, (GLuint, GLsizei, GLsizei*, GLchar*))
 SDL_PROC(void, glGenBuffers, (GLsizei, GLuint *))
-SDL_PROC(void, glDeleteBuffers, (GLsizei, GLuint *))
+SDL_PROC(void, glDeleteBuffers, (GLsizei, const GLuint *))
 SDL_PROC(void, glBindBuffer, (GLenum, GLuint))
 SDL_PROC(void, glBufferData, (GLenum, GLsizeiptr, const GLvoid *, GLenum))
 SDL_PROC(void, glBufferSubData, (GLenum, GLintptr, GLsizeiptr, const GLvoid *))