audit: mark as not available for static builds

audit uses -fPIE/-pie, which is not compatible with static only builds
with uClibc. Since using audit in a statically linked environment is
probably not a very common use case, let's simply mark it as
non-available in such situations.

Fixes:

  http://autobuild.buildroot.net/results/549492270f3f43747a96a8326aef1d7ae1d3b213/

Thanks to Waldemar for explaining the source of the problem.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/audit/Config.in

@@ -8,6 +8,7 @@ config BR2_PACKAGE_AUDIT
 	bool "audit"
 	depends on BR2_PACKAGE_AUDIT_ARCH_SUPPORTS
 	depends on BR2_TOOLCHAIN_HAS_THREADS
+	depends on !BR2_STATIC_LIBS
 	help
 	  The audit package contains the user space utilities for
 	  storing and searching the audit records generated by
@@ -17,6 +18,6 @@ config BR2_PACKAGE_AUDIT
 
 	  http://people.redhat.com/sgrubb/audit/
 
-comment "audit needs a toolchain w/ threads"
-	depends on !BR2_TOOLCHAIN_HAS_THREADS
+comment "audit needs a toolchain w/ threads, dynamic library"
+	depends on !BR2_TOOLCHAIN_HAS_THREADS || BR2_STATIC_LIBS
 	depends on BR2_PACKAGE_AUDIT_ARCH_SUPPORTS