Revert "assimp: Intentionally make the checksum wrong to test the server"

This reverts commit e5add0b944.

Fixes #531.

Signed-off-by: Timothy Gu <timothygu99@gmail.com>

src/assimp.mk

@@ -4,7 +4,7 @@
 PKG             := assimp
 $(PKG)_IGNORE   :=
 $(PKG)_VERSION  := 3.1.1
-$(PKG)_CHECKSUM := 16a565683c8945b1ee131452f2649d2ba3a3
+$(PKG)_CHECKSUM := 16a565683c8945b1ee131452f2649d2ba3a3ff49
 $(PKG)_SUBDIR   := $(PKG)-$($(PKG)_VERSION)
 $(PKG)_FILE     := $(PKG)-$($(PKG)_VERSION).zip
 $(PKG)_URL      := http://$(SOURCEFORGE_MIRROR)/project/$(PKG)/$(PKG)-$(call SHORT_PKG_VERSION,$(PKG))/$($(PKG)_FILE)