Makefile: move BFD_ROOT_DIR to tools/gdb/Makefile

BFD_ROOT_DIR is used only in tools/gdb/Makefile

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/config.mk b/config.mk
index 74617d3..dfe81fa 100644
--- a/config.mk
+++ b/config.mk
@@ -220,29 +220,6 @@
 LDFLAGS_$(SPL_BIN) += -Ttext $(CONFIG_SPL_TEXT_BASE)
 endif
 
-# Location of a usable BFD library, where we define "usable" as
-# "built for ${HOST}, supports ${TARGET}".  Sensible values are
-# - When cross-compiling: the root of the cross-environment
-# - Linux/ppc (native): /usr
-# - NetBSD/ppc (native): you lose ... (must extract these from the
-#   binutils build directory, plus the native and U-Boot include
-#   files don't like each other)
-#
-# So far, this is used only by tools/gdb/Makefile.
-
-ifeq ($(HOSTOS),darwin)
-BFD_ROOT_DIR =		/usr/local/tools
-else
-ifeq ($(HOSTARCH),$(ARCH))
-# native
-BFD_ROOT_DIR =		/usr
-else
-#BFD_ROOT_DIR =		/LinuxPPC/CDK		# Linux/i386
-#BFD_ROOT_DIR =		/usr/pkg/cross		# NetBSD/i386
-BFD_ROOT_DIR =		/opt/powerpc
-endif
-endif
-
 #########################################################################
 
 export	CONFIG_SYS_TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS
diff --git a/tools/gdb/Makefile b/tools/gdb/Makefile
index 850bb9b..4513320 100644
--- a/tools/gdb/Makefile
+++ b/tools/gdb/Makefile
@@ -10,6 +10,27 @@
 
 ifneq ($(HOSTOS),cygwin)
 
+# Location of a usable BFD library, where we define "usable" as
+# "built for ${HOST}, supports ${TARGET}".  Sensible values are
+# - When cross-compiling: the root of the cross-environment
+# - Linux/ppc (native): /usr
+# - NetBSD/ppc (native): you lose ... (must extract these from the
+#   binutils build directory, plus the native and U-Boot include
+#   files don't like each other)
+
+ifeq ($(HOSTOS),darwin)
+BFD_ROOT_DIR =		/usr/local/tools
+else
+ifeq ($(HOSTARCH),$(ARCH))
+# native
+BFD_ROOT_DIR =		/usr
+else
+#BFD_ROOT_DIR =		/LinuxPPC/CDK		# Linux/i386
+#BFD_ROOT_DIR =		/usr/pkg/cross		# NetBSD/i386
+BFD_ROOT_DIR =		/opt/powerpc
+endif
+endif
+
 #
 # Use native tools and options
 #