package/squid: needs threads

squid needs threads and
https://github.com/squid-cache/squid/commit/7dba4ac446341548a0b101489785f2cef9a33caa
to avoid the following build failure raised since
bump to version 5.3 in commit efc07b7a1818787229ddb335ca26ff2cf03820ae:

ntlm_fake_auth.cc: In function 'int main(int, char**)':
ntlm_fake_auth.cc:187:18: error: 'std::this_thread' has not been declared
  187 |             std::this_thread::sleep_for(std::chrono::milliseconds(response_delay));
      |                  ^~~~~~~~~~~

Fixes:
 - http://autobuild.buildroot.org/results/2aabc8375d41ad4d047d20ff8ee4fe1c978e7ee1

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/squid/Config.in

@@ -1,13 +1,16 @@
-comment "squid needs a toolchain w/ C++, gcc >= 4.8 not affected by bug 64735"
+comment "squid needs a toolchain w/ C++, threads, gcc >= 4.8 not affected by bug 64735"
 	depends on BR2_USE_MMU
 	depends on BR2_TOOLCHAIN_HAS_ATOMIC
 	depends on BR2_TOOLCHAIN_HAS_GCC_BUG_64735 || \
-		!BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
+		!BR2_INSTALL_LIBSTDCPP || \
+		!BR2_TOOLCHAIN_HAS_THREADS || \
+		!BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
 
 config BR2_PACKAGE_SQUID
 	bool "squid"
 	depends on BR2_TOOLCHAIN_HAS_ATOMIC
 	depends on BR2_INSTALL_LIBSTDCPP
+	depends on BR2_TOOLCHAIN_HAS_THREADS
 	depends on !BR2_TOOLCHAIN_HAS_GCC_BUG_64735 # std::current_exception
 	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_8 # C++11
 	# needs fork()