[PATCH] xf86drm: fix build error by udev dependency

[Joonyoung Shim <jy0922.shim@xxxxxxxxxxx>]

The build error is introduced by commit fde496917682 ("Add device
enumeration interface (v4)") if don't enable udev. Can solve as check
UDEV dependency.

  CC       libdrm_la-xf86drm.lo
xf86drm.c:66:21: fatal error: libudev.h: No such file or directory
 #include "libudev.h"
                     ^
compilation terminated.
make[2]: *** [libdrm_la-xf86drm.lo] Error 1

Signed-off-by: Joonyoung Shim <jy0922.shim@xxxxxxxxxxx>
---
 xf86drm.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/xf86drm.c b/xf86drm.c
index b5a174b..4a31019 100644
--- a/xf86drm.c
+++ b/xf86drm.c
@@ -63,7 +63,9 @@
 
 #include "xf86drm.h"
 #include "libdrm_macros.h"
+#if defined(UDEV)
 #include "libudev.h"
+#endif
 
 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
 #define DRM_MAJOR 145
@@ -2819,6 +2821,7 @@ char *drmGetRenderDeviceNameFromFd(int fd)
 	return drmGetMinorNameForFD(fd, DRM_NODE_RENDER);
 }
 
+#if defined(UDEV)
 /**
 * Enumerate the GPU devices on the system
 *
@@ -2917,3 +2920,4 @@ int drmGetPciDevices(drmPciDevicePtr devSet, uint16_t vendorId)
 
 	return drmDevCount;
 }
+#endif
-- 
1.9.1

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