tstools: requires dynamic library support

tstools Makefile tries to build shared libtstools.so library unconditionally.

Fixes:
http://autobuild.buildroot.net/results/208/20830bccab8508aab215c5fc8010e180cc68af51/
http://autobuild.buildroot.net/results/988/9882f93e11dbaba8c6973bedc9d00dbb238a4c06/
http://autobuild.buildroot.net/results/11c/11c802bcfab70a0a2593079657529c763fd82aa1/

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/tstools/Config.in

@@ -1,6 +1,7 @@
 config BR2_PACKAGE_TSTOOLS
 	bool "tstools"
 	depends on BR2_USE_MMU # fork()
+	depends on !BR2_STATIC_LIBS
 	help
 	  This is a set of cross-platform command line tools for working with
 	  MPEG data.
@@ -14,3 +15,7 @@ config BR2_PACKAGE_TSTOOLS
 	  data on DVDs.
 
 	  https://github.com/kynesim/tstools/
+
+comment "tstools needs a toolchain w/ dynamic library"
+	depends on BR2_USE_MMU
+	depends on BR2_STATIC_LIBS