Update buildroot 2018.05

Signed-off-by: Pascal Vizeli <pvizeli@syshack.ch>

buildroot/package/libfreeimage/0004-fix-gcc-6.patch

@@ -12,20 +12,20 @@ diff -durN a/Source/LibRawLite/internal/dcraw_common.cpp b/Source/LibRawLite/int
 --- a/Source/LibRawLite/internal/dcraw_common.cpp
 +++ b/Source/LibRawLite/internal/dcraw_common.cpp
 @@ -2479,7 +2479,7 @@
- 
- void CLASS kodak_radc_load_raw()
- {
--  static const char src[] = {
-+  static const signed char src[] = {
-     1,1, 2,3, 3,4, 4,2, 5,7, 6,5, 7,6, 7,8,
-     1,0, 2,1, 3,3, 4,4, 5,2, 6,7, 7,6, 8,5, 8,8,
-     2,1, 2,3, 3,0, 3,2, 3,4, 4,6, 5,5, 6,7, 6,8,
+ 
+ void CLASS kodak_radc_load_raw()
+ {
+-  static const char src[] = {
++  static const signed char src[] = {
+     1,1, 2,3, 3,4, 4,2, 5,7, 6,5, 7,6, 7,8,
+     1,0, 2,1, 3,3, 4,4, 5,2, 6,7, 7,6, 8,5, 8,8,
+     2,1, 2,3, 3,0, 3,2, 3,4, 4,6, 5,5, 6,7, 6,8,
 @@ -4519,7 +4519,7 @@
-  */
- void CLASS vng_interpolate()
- {
--  static const signed char *cp, terms[] = {
-+  static const int *cp, terms[] = {
-     -2,-2,+0,-1,0,0x01, -2,-2,+0,+0,1,0x01, -2,-1,-1,+0,0,0x01,
-     -2,-1,+0,-1,0,0x02, -2,-1,+0,+0,0,0x03, -2,-1,+0,+1,1,0x01,
-     -2,+0,+0,-1,0,0x06, -2,+0,+0,+0,1,0x02, -2,+0,+0,+1,0,0x03,
+  */
+ void CLASS vng_interpolate()
+ {
+-  static const signed char *cp, terms[] = {
++  static const int *cp, terms[] = {
+     -2,-2,+0,-1,0,0x01, -2,-2,+0,+0,1,0x01, -2,-1,-1,+0,0,0x01,
+     -2,-1,+0,-1,0,0x02, -2,-1,+0,+0,0,0x03, -2,-1,+0,+1,1,0x01,
+     -2,+0,+0,-1,0,0x06, -2,+0,+0,+0,1,0x02, -2,+0,+0,+1,0,0x03,