flann: disable on microblaze

All gcc versions fail to build flann on the Microblaze architecture, due
to gcc bug https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69401, so let's
disable this package on this architecture.

Fixes:

  http://autobuild.buildroot.net/results/3f44a1f30a88dbe4a3a83055267b472b58769e15/

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

package/flann/Config.in

@@ -2,6 +2,9 @@ config BR2_PACKAGE_FLANN
 	bool "flann"
 	depends on BR2_INSTALL_LIBSTDCPP
 	depends on !BR2_STATIC_LIBS
+	# all gcc versions fail to build flann on Microblaze due to
+	# gcc bug https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69401
+	depends on !BR2_microblaze
 	help
 	  FLANN is a library for performing fast approximate nearest
 	  neighbor searches in high dimensional spaces. It contains a
@@ -22,4 +25,5 @@ config BR2_PACKAGE_FLANN_EXAMPLES
 endif
 
 comment "flann needs a toolchain w/ C++, dynamic library"
+	depends on !BR2_microblaze
 	depends on !BR2_INSTALL_LIBSTDCPP || BR2_STATIC_LIBS