egl/drivers: include stdint.h where needed

Currently these files are including it indirectly via eglcompiler.h
The latter of which will be removed with follow up commits.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
diff --git a/src/egl/drivers/dri2/egl_dri2.c b/src/egl/drivers/dri2/egl_dri2.c
index 6306483..d503196 100644
--- a/src/egl/drivers/dri2/egl_dri2.c
+++ b/src/egl/drivers/dri2/egl_dri2.c
@@ -27,6 +27,7 @@
 
 #define WL_HIDE_DEPRECATED
 
+#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>