package/linux-tools: cpupower needs dynamic library

cpupower needs dynamic library since its addition in commit
f1863ede94c29e120d7ce900f7cce211f1e8633a to avoid the following build
failure:

ld (ld-elf2flt): -shared used without passing a shared library ID

Fixes:
 - http://autobuild.buildroot.org/results/16f41b9169bd76352c2f2ed8c6239ad371b3a30e

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
(cherry picked from commit c173eb47bfc908be3d3fd204a49c71ce3290f5d5)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/linux-tools/Config.in

@@ -7,12 +7,16 @@ config BR2_PACKAGE_LINUX_TOOLS
 
 config BR2_PACKAGE_LINUX_TOOLS_CPUPOWER
 	bool "cpupower"
+	depends on !BR2_STATIC_LIBS
 	select BR2_PACKAGE_LINUX_TOOLS
 	select BR2_PACKAGE_PCIUTILS
 	help
 	  cpupower is a collection of tools to examine and tune power
 	  saving related features of your processor.
 
+comment "cpupower needs a toolchain w/ dynamic library"
+	depends on BR2_STATIC_LIBS
+
 config BR2_PACKAGE_LINUX_TOOLS_GPIO
 	bool "gpio"
 	select BR2_PACKAGE_LINUX_TOOLS