egl: add HAVE_LIBDRM define, fix EGL X11 platform

Commit a594cec broke EGL X11 backend by adding dependency between
X11 and DRM backends requiring HAVE_EGL_PLATFORM_DRM defined for X11.

This patch fixes the issue by adding additional define for libdrm
detection independent of which backend is being compiled. Tested by
compiling Mesa with '--with-egl-platforms=x11' and running es2gears_x11
+ glbenchmark2.7 successfully.

v2: return true for dri2_auth if running without libdrm (Samuel)
v3: check libdrm when building EGL drm platform + AM_CFLAGS fix (Emil)

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=72062
Signed-off-by: Tapani Pälli <[email protected]>
Reviewed-by: Emil Velikov <[email protected]>
Reviewed-by: Chad Versace <[email protected]>
Cc: Samuel Thibault <[email protected]>
Cc: [email protected]

1 files changed, 3 insertions, 6 deletions

diff --git a/src/egl/drivers/dri2/platform_x11.c b/src/egl/drivers/dri2/platform_x11.c
index c56a4138a64..04cb62b41d3 100644
--- a/src/egl/drivers/dri2/platform_x11.c
+++ b/src/egl/drivers/dri2/platform_x11.c
@@ -33,7 +33,7 @@
 #include <fcntl.h>
 #include <errno.h>
 #include <unistd.h>
-#ifdef HAVE_DRM_PLATFORM
+#ifdef HAVE_LIBDRM
 #include <xf86drm.h>
 #endif
 #include <sys/types.h>
@@ -608,7 +608,7 @@ dri2_x11_authenticate(_EGLDisplay *disp, uint32_t id)
 static EGLBoolean
 dri2_authenticate(_EGLDisplay *disp)
 {
-#ifdef HAVE_DRM_PLATFORM
+#ifdef HAVE_LIBDRM
    struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
    drm_magic_t magic;
 
@@ -621,11 +621,8 @@ dri2_authenticate(_EGLDisplay *disp)
       _eglLog(_EGL_WARNING, "DRI2: failed to authenticate");
       return EGL_FALSE;
    }
-
-   return EGL_TRUE;
-#else
-   return EGL_FALSE;
 #endif
+   return EGL_TRUE;
 }
 
 static EGLBoolean