package/haproxy: fix build on m68k

When threads are enabled, haproxy expects that pthread_getcpuclockid is
available which is not the case on m68k. Fix this by enabling threads
support only if NPTL is available.

Fixes:
 - http://autobuild.buildroot.org/results/52cc4b1fcac2a4fc84ab15ec4c692d2cd9b6d8bd

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit fb7fd98774b94d7c50f381ae4e2d005db21afb3e)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/haproxy/haproxy.mk

@@ -19,7 +19,7 @@ ifeq ($(BR2_TOOLCHAIN_HAS_LIBATOMIC),y)
 HAPROXY_LIBS += -latomic
 endif
 
-ifeq ($(BR2_TOOLCHAIN_HAS_THREADS),y)
+ifeq ($(BR2_TOOLCHAIN_HAS_THREADS_NPTL),y)
 # threads uses atomics on gcc >= 4.7 and sync otherwise (see
 # include/common/hathreads.h)
 ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_4_7):$(BR2_TOOLCHAIN_HAS_ATOMIC),y:y)