package/gauche: fix build error on BR2_STATIC_LIBS

Building gauche depends on dynamic link, so add dependency on
!BR2_STATIC_LIBS.

Fix:
http://autobuild.buildroot.org/results/da5/da5b9605552d4914c5e6f0d890367b92536419c1

Signed-off-by: Hiroshi Kawashima <kei-k@ca2.so-net.ne.jp>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/gauche/Config.in

@@ -13,6 +13,7 @@ config BR2_PACKAGE_GAUCHE
 	depends on BR2_USE_MMU # fork()
 	depends on BR2_ARCH_HAS_ATOMICS
 	depends on BR2_PACKAGE_GAUCHE_ARCH_SUPPORTS
+	depends on !BR2_STATIC_LIBS
 	help
 	  Gauche is an R7RS Scheme implementation developed to be a
 	  handy script interpreter, which allows programmers and
@@ -23,8 +24,8 @@ config BR2_PACKAGE_GAUCHE
 
 	  http://practical-scheme.net/gauche/
 
-comment "gauche needs a toolchain w/ NPTL"
+comment "gauche needs a toolchain w/ NPTL, dynamic library"
 	depends on BR2_USE_MMU
 	depends on BR2_ARCH_HAS_ATOMICS
 	depends on BR2_PACKAGE_GAUCHE_ARCH_SUPPORTS
-	depends on !BR2_TOOLCHAIN_HAS_THREADS_NPTL
+	depends on !BR2_TOOLCHAIN_HAS_THREADS_NPTL || BR2_STATIC_LIBS