package/bullet: bump to verion 2.88

Add license file hash.

See release notes:
https://github.com/bulletphysics/bullet3/releases/tag/2.88

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/bullet/bullet.hash

@@ -1,2 +1,3 @@
 # Locally calculated
-sha256 c058b2e4321ba6adaa656976c1a138c07b18fc03b29f5b82880d5d8228fbf059  bullet-2.86.1.tar.gz
+sha256 21c135775527754fc2929db1db5144e92ad0218ae72840a9f162acb467a7bbf9  bullet-2.88.tar.gz
+sha256 885cd516a8420acb7c3e0b1a7119913b686495001ae564e3229740460e8cff59  LICENSE.txt

package/bullet/bullet.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-BULLET_VERSION = 2.86.1
+BULLET_VERSION = 2.88
 BULLET_SITE = $(call github,bulletphysics,bullet3,$(BULLET_VERSION))
 BULLET_INSTALL_STAGING = YES
 BULLET_LICENSE = Zlib