update libdrm to 2.4.15.

This diff seems larger than it is since upstream reindented some
sources.  This updates libdrm_intel to -current (which only affect the
GEM code) and libdrm to 2.4.15.  bumping both minor versions.

Discussed with matthieu@

1 files changed, 0 insertions, 3 deletions

diff --git a/lib/libdrm/xf86drmSL.c b/lib/libdrm/xf86drmSL.c
index 58aefac71..acddb5411 100644
--- a/lib/libdrm/xf86drmSL.c
+++ b/lib/libdrm/xf86drmSL.c
@@ -265,11 +265,8 @@ int drmSLLookupNeighbors(void *l, unsigned long key,
 {
     SkipListPtr   list = (SkipListPtr)l;
     SLEntryPtr    update[SL_MAX_LEVEL + 1];
-    SLEntryPtr    entry;
     int           retcode = 0;
 
-    entry = SLLocate(list, key, update);
-
     *prev_key   = *next_key   = key;
     *prev_value = *next_value = NULL;