assimp: remove dead "depends on" dependency

BR2_TOOLCHAIN_EXTERNAL_BLACKFIN_UCLINUX has been removed in commit
311bc137da2952445683413794f3ebc8e477c9ef ("toolchain: kill ADI
Blackfin toolchain"), so this "depends on" is useless.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/assimp/Config.in

@@ -4,11 +4,6 @@ config BR2_PACKAGE_ASSIMP
 	# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71124, that
 	# cause an infinite loop in gcc when building this package.
 	depends on !BR2_microblaze
-	# The ADI Blackfin toolchain does not build assimp properly,
-	# fails with "internal compiler error: in simplify_subreg, at
-	# simplify-rtx.c:5001". It builds fine with a mainline gcc for
-	# Blackfin.
-	depends on !BR2_TOOLCHAIN_EXTERNAL_BLACKFIN_UCLINUX
 	depends on BR2_INSTALL_LIBSTDCPP
 	select BR2_PACKAGE_ZLIB
 	help