npth: Check for pthread_create for including lpthread

pthread_detach() is moved into libc which means this test will fail
so check for pthead_create again

[1] https://sourceware.org/git/?p=glibc.git;a=commit;h=df65f897e9501aa5b64a5cbcb101301715f2ec2f
(From OE-Core rev: e82742849e6228f892a489bfbd02c365c4a8607e)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-support/npth/npth/0001-Revert-Fix-problem-with-regression-tests-on-recent-g.patch

@@ -0,0 +1,43 @@
+From e43524868bb4901703d63876f9d49f73ca75b3ab Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Wed, 12 May 2021 20:27:52 -0700
+Subject: [PATCH] Revert "Fix problem with regression tests on recent glibc."
+
+This reverts commit 3a9d32eb59194b989656548755066ccd9feb36ac.
+
+Upstream-Status: Pending
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+ configure.ac | 8 +++-----
+ 1 file changed, 3 insertions(+), 5 deletions(-)
+
+diff --git a/configure.ac b/configure.ac
+index 8a9373c..8cda28d 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -284,11 +284,9 @@ AC_TYPE_SSIZE_T
+ #
+ # Checks for libraries and functions.
+ #
+-#   We test for pthread_detach because glibc 2.22 includes
+-#   pthread_create but not pthread_detach.
+ if test "$have_w32_system" = no; then
+-  AC_SEARCH_LIBS([pthread_detach],[pthread])
+-  case "x$ac_cv_search_pthread_detach" in
++  AC_SEARCH_LIBS([pthread_create],[pthread])
++  case "x$ac_cv_search_pthread_create" in
+     xno)
+       have_pthread=no
+       ;;
+@@ -297,7 +295,7 @@ if test "$have_w32_system" = no; then
+       ;;
+     *)
+       have_pthread=yes
+-      config_libs="$config_libs $ac_cv_search_pthread_detach"
++      config_libs="$config_libs $ac_cv_search_pthread_create"
+       ;;
+   esac
+   if test "$have_pthread" != no; then
+-- 
+2.31.1
+

meta/recipes-support/npth/npth_1.6.bb

@@ -9,6 +9,7 @@ LIC_FILES_CHKSUM = "\
 UPSTREAM_CHECK_URI = "https://gnupg.org/download/index.html"
 SRC_URI = "${GNUPG_MIRROR}/npth/npth-${PV}.tar.bz2 \
            file://pkgconfig.patch \
+           file://0001-Revert-Fix-problem-with-regression-tests-on-recent-g.patch \
           "
 
 SRC_URI[md5sum] = "375d1a15ad969f32d25f1a7630929854"