classpath: only allow on supported architectures

In commit a75ab1f ("package/classpath:
Don't depend on jamvm"), we removed the dependency of classpath on
jamvm. Since jamvm is only available for a reduced set of architectures,
classpath could until this commit until be built on those architectures.

However, now that this dependency has been removed, classpath can
potentially be built for all architectures supported by Buildroot, even
though it doesn't support all of them.

Since adding support for additional architectures in classpath doesn't
make much sense, because classpath is in Buildroot only usable with
JamVM anyway, and JamVM is only available for a small set of
architectures, this commit simply makes classpath available on the
architectures that it supports.

By doing so, it also removes the or1k support patch which was added by
commit f12a146, since anyway or1k is
not supported by JamVM.

Fixes:

  http://autobuild.buildroot.net/results/55eb89f89e96b94a821778bc18ed844af08b7460/
  (classpath on microblaze)

  http://autobuild.buildroot.net/results/279dd731bd9ecf5f9d54bda3715caeaa7cbcdbb3/
  (classpath on nios2)

Signed-off-by: Thomas Petazzoni <[email protected]>
Signed-off-by: Peter Korsgaard <[email protected]>

Author: tpetazzoni

package/classpath/0003-add-or1k-endian.patch

@@ -1,7 +1,15 @@
+config BR2_PACKAGE_CLASSPATH_ARCH_SUPPORTS
+	bool
+	default y if BR2_arm || BR2_armeb || BR2_i386 || BR2_m68k \
+		|| BR2_mips || BR2_mipsel || BR2_mips64 || BR2_mips64el \
+		|| BR2_powerpc || BR2_powerpc64 || BR2_powerpc64le \
+		|| BR2_sh || BR2_x86_64
+
 config BR2_PACKAGE_CLASSPATH
 	bool "classpath"
 	select BR2_NEEDS_HOST_JAR
 	select BR2_NEEDS_HOST_JAVAC
+	depends on BR2_PACKAGE_CLASSPATH_ARCH_SUPPORTS
 	help
 	  GNU Classpath, Essential Libraries for Java, is a GNU
 	  project to create free core class libraries for use with

package/classpath/Config.in

@@ -4,6 +4,7 @@ config BR2_PACKAGE_JAMVM
 	depends on !BR2_STATIC_LIBS
 	depends on BR2_arm || BR2_armeb || BR2_i386 || BR2_x86_64 \
 		|| BR2_mips || BR2_mipsel || BR2_powerpc
+	depends on BR2_PACKAGE_CLASSPATH_ARCH_SUPPORTS
 	select BR2_PACKAGE_ZLIB
 	select BR2_PACKAGE_CLASSPATH
 	help
@@ -15,4 +16,5 @@ config BR2_PACKAGE_JAMVM
 comment "jamvm needs a toolchain w/ threads, dynamic library"
 	depends on BR2_arm || BR2_armeb || BR2_i386 || BR2_x86_64 \
 		|| BR2_mips || BR2_mipsel || BR2_powerpc
+	depends on BR2_PACKAGE_CLASSPATH_ARCH_SUPPORTS
 	depends on !BR2_TOOLCHAIN_HAS_THREADS || BR2_STATIC_LIBS