package/poco: disable for static build

poco requires dlopen(). There is a --no-sharedlibs option that is
supposed to support building in a statically linked environment, but
it doesn't do anything.

Fixes:

  http://autobuild.buildroot.net/results/952/952f05efd245ba59991f3c5be02a0572e8b9e544/

Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/poco/Config.in

@@ -3,6 +3,7 @@ config BR2_PACKAGE_POCO
 	depends on BR2_INSTALL_LIBSTDCPP
 	depends on BR2_USE_WCHAR
 	depends on BR2_TOOLCHAIN_HAS_THREADS
+	depends on !BR2_STATIC_LIBS # dlopen()
 	depends on !(BR2_arc || BR2_bfin || BR2_microblaze || BR2_mipsel \
 		|| BR2_xtensa)
 	select BR2_PACKAGE_ZLIB
@@ -60,8 +61,8 @@ config BR2_PACKAGE_POCO_DATA_MYSQL
 
 endif # BR2_PACKAGE_POCO
 
-comment "poco needs a toolchain w/ wchar, threads, C++"
+comment "poco needs a toolchain w/ wchar, threads, C++, dynamic library"
 	depends on !BR2_USE_WCHAR || !BR2_INSTALL_LIBSTDCPP \
-		|| !BR2_TOOLCHAIN_HAS_THREADS
+		|| !BR2_TOOLCHAIN_HAS_THREADS || BR2_STATIC_LIBS
 	depends on !(BR2_arc || BR2_bfin || BR2_microblaze || BR2_mipsel \
 		|| BR2_xtensa)