Revert "egl: move alloc & init out of _eglBuiltInDriver{DRI2,Haiku}"

This reverts commit 8cb84c8477.

This fixes crashing shader-db/run.

src/egl/main/README.txt

@@ -19,12 +19,13 @@ Bootstrapping:
 When the apps calls eglInitialize() a device driver is selected and loaded
 (look for _eglAddDrivers() and _eglLoadModule() in egldriver.c).
 
-The built-in driver's entry point function is then called and given
-a freshly allocated and initialised _EGLDriver, with default fallback
-entrypoints set.
+The built-in driver's entry point function is then called.  This driver function
+allocates, initializes and returns a new _EGLDriver object (usually a
+subclass of that type).
 
 As part of initialization, the dispatch table in _EGLDriver->API must be
-populated with all the EGL entrypoints. Some functions like
+populated with all the EGL entrypoints.  Typically, _eglInitDriverFallbacks()
+can be used to plug in default/fallback functions.  Some functions like
 driver->API.Initialize and driver->API.Terminate _must_ be implemented
 with driver-specific code (no default/fallback function is possible).
 

src/egl/main/egldriver.c

@@ -54,12 +54,8 @@ _eglGetDriver(void)
 {
    mtx_lock(&_eglModuleMutex);
 
-   if (!_eglDriver) {
-      _eglDriver = calloc(1, sizeof(*_eglDriver));
-      if (!_eglDriver)
-         return NULL;
-      _eglInitDriver(_eglDriver);
-   }
+   if (!_eglDriver)
+      _eglDriver = _eglBuiltInDriver();
 
    mtx_unlock(&_eglModuleMutex);
 

src/egl/main/egldriver.h

@@ -81,8 +81,8 @@ struct _egl_driver
 };
 
 
-extern void
-_eglInitDriver(_EGLDriver *driver);
+extern _EGLDriver*
+_eglBuiltInDriver(void);
 
 
 extern _EGLDriver *