perf: Fix build on aarch64

Somehow perf depended on libunwind, and libunwind also builds on
aarch64.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

package/devel/perf/Makefile

@@ -26,7 +26,7 @@ include $(INCLUDE_DIR)/package.mk
 define Package/perf
   SECTION:=devel
   CATEGORY:=Development
-  DEPENDS:= +libelf1 +libdw +(mips||mipsel||powerpc||i386||x86_64||arm):libunwind +libpthread +librt +objdump @!LINUX_3_18 @!IN_SDK
+  DEPENDS:= +libelf1 +libdw +(mips||mipsel||powerpc||i386||x86_64||arm||aarch64):libunwind +libpthread +librt +objdump @!LINUX_3_18 @!IN_SDK
   TITLE:=Linux performance monitoring tool
   VERSION:=$(LINUX_VERSION)-$(PKG_RELEASE)
   URL:=http://www.kernel.org

package/libs/libunwind/Makefile

@@ -31,7 +31,7 @@ define Package/libunwind
   CATEGORY:=Libraries
   TITLE:=The libunwind project
   URL:=http://www.nongnu.org/libunwind/
-  DEPENDS:=@(mips||mipsel||powerpc||i386||x86_64||arm)
+  DEPENDS:=@(mips||mipsel||powerpc||i386||x86_64||arm||aarch64)
 endef
 
 define Package/libunwind/description