perl-sys-cpu: disable in static configurations

The perl-sys-cpu package builds a native shared library, which makes
it incompatible with static-only configurations.

Fixes:

  http://autobuild.buildroot.net/results/ea64c2d8022932162d36301ca4061f61cd208c11/

Signed-off-by: Christopher McCrory <chrismcc@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/perl-sys-cpu/Config.in

@@ -1,5 +1,9 @@
 config BR2_PACKAGE_PERL_SYS_CPU
 	bool "perl-sys-cpu"
+	depends on !BR2_STATIC_LIBS
 	help
 	  Perl module for getting information about the system CPU
 	  (Sys::CPU).
+
+comment "perl-sys-cpu needs a toolchain w/ dynamic library"
+	depends on BR2_STATIC_LIBS