Configure: fixed static compilation with OpenSSL 1.1.1.

OpenSSL now uses pthread_atfork(), and this requires -lpthread on Linux
to compile.  Introduced NGX_LIBPTHREAD to add it as appropriate, similar
to existing NGX_LIBDL.

1 files changed, 1 insertions, 0 deletions

diff --git a/auto/unix b/auto/unix
index 90b5894a3..43d3b25a5 100644
--- a/auto/unix
+++ b/auto/unix
@@ -901,6 +901,7 @@ if [ $ngx_found = no ]; then
 
     if [ $ngx_found = yes ]; then
         CORE_LIBS="$CORE_LIBS -lpthread"
+        NGX_LIBPTHREAD="-lpthread"
     fi
 fi