remove unneeded environment override for libpcap/tcpdump

package/libpcap/Makefile

@@ -23,7 +23,6 @@ include $(ADK_TOPDIR)/mk/package.mk
 $(eval $(call PKG_template,LIBPCAP,libpcap,$(PKG_VERSION)-${PKG_RELEASE},${PKG_DEPENDS},${PKG_DESCR},${PKG_SECTION},${PKG_OPTS}))
 
 XAKE_FLAGS+=		GCC_HONOUR_COPTS=s
-CONFIGURE_ENV+=		ac_cv_linux_vers=26
 CONFIGURE_ARGS+=	--disable-yydebug \
 			--disable-dbus \
 			--without-libnl \

package/tcpdump/Makefile

@@ -25,7 +25,6 @@ include ${ADK_TOPDIR}/mk/package.mk
 $(eval $(call PKG_template,TCPDUMP,tcpdump,${PKG_VERSION}-${PKG_RELEASE},${PKG_DEPENDS},${PKG_DESCR},${PKG_SECTION}))
 
 CONFIGURE_ENV+=		BUILD_CC="${TARGET_CC}" HOSTCC=${CC_FOR_BUILD} \
-			ac_cv_linux_vers=2 \
 			td_cv_buggygetaddrinfo="no"
 CONFIGURE_ARGS+=	--without-crypto
 ifneq (${ADK_PACKAGE_TCPDUMP_WITH_IPV6},)