uboot-tools: add missing !BR2_STATIC_LIBS dependency for FIT signature

BR2_PACKAGE_UBOOT_TOOLS_FIT_SUPPORT selects BR2_PACKAGE_DTC, but forgets
to depends on !BR2_STATIC_LIBS like BR2_PACKAGE_DTC does.

Fixes the following kconfig warning:

  arning: (BR2_PACKAGE_UBOOT_TOOLS_FIT_SUPPORT && BR2_PACKAGE_KVMTOOL && BR2_PACKAGE_UBOOT_TOOLS_MKIMAGE_FIT_SIGNATURE_SUPPORT) selects BR2_PACKAGE_DTC which has unmet direct dependencies (!BR2_STATIC_LIBS)

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

package/uboot-tools/Config.in

@@ -9,6 +9,7 @@ if BR2_PACKAGE_UBOOT_TOOLS
 
 config BR2_PACKAGE_UBOOT_TOOLS_FIT_SUPPORT
 	bool "Flattened Image Tree (FIT) support"
+	depends on !BR2_STATIC_LIBS
 	select BR2_PACKAGE_DTC
 	select BR2_PACKAGE_DTC_PROGRAMS
 	help
@@ -20,6 +21,9 @@ config BR2_PACKAGE_UBOOT_TOOLS_FIT_SUPPORT
 	  in a single blob. To boot this new uImage structure,
 	  pass the address of the blob to the "bootm" command.
 
+comment "u-boot tools FIT support needs a toolchain w/ dynamic library"
+	depends on !BR2_STATIC_LIBS
+
 if BR2_PACKAGE_UBOOT_TOOLS_FIT_SUPPORT
 
 config BR2_PACKAGE_UBOOT_TOOLS_FIT_SIGNATURE_SUPPORT