Do not error out if lib is symlinked to lib64

Distros are now creating a symlink between /lib and /lib64, and
between /usr/lib and /usr/lib64, in accordance with recent
agreements on file system conventions. Thus, if we detect that
the package file exists in both places, check that the two
locations are not symlinks before declaring ambiguity and
exiting with an error.

Port of openpmix/openpmix@813d8ba
Signed-off-by: Ralph Castain <rhc@pmix.org>

(cherry picked from commit a0a57f1)

config/oac_check_package.m4

@@ -2,6 +2,7 @@ dnl -*- autoconf -*-
 dnl
 dnl Copyright (c) 2022      Amazon.com, Inc. or its affiliates.
 dnl                         All Rights reserved.
+dnl Copyright (c) 2022      Nanook Consulting.  All rights reserved.
 dnl $COPYRIGHT$
 dnl
 dnl Additional copyrights may follow
@@ -315,9 +316,12 @@ AC_DEFUN([_OAC_CHECK_PACKAGE_PKGCONFIG], [
                       [test -z "${check_package_prefix}"],
                       [check_package_cv_$1_pcfilename="pcname"],
                       [test -r "${check_package_prefix}/lib/pkgconfig/pcname.pc" -a -r "${check_package_prefix}/lib64/pkgconfig/pcname.pc"],
-                      [AC_MSG_ERROR([Found pcname in both ${check_package_prefix}/lib/pkgconfig and
+                      [AS_IF([test ! -L "${check_package_prefix}/lib" &&
+                              test ! -L "${check_package_prefix}/lib64"],
+                             [AC_MSG_ERROR([Found pcname in both ${check_package_prefix}/lib/pkgconfig and
 ${check_package_prefix}/lib64/pkgconfig.  This is confusing.  Please add --with-$1-libdir=PATH
 to configure to help disambiguate.])],
+                             [check_package_cv_$1_pcfilename="${check_package_prefix}/lib/pkgconfig/pcname.pc"])],
                       [test -r "${check_package_prefix}/lib64/pkgconfig/pcname.pc"],
                       [check_package_cv_$1_pcfilename="${check_package_prefix}/lib64/pkgconfig/pcname.pc"],
                       [check_package_cv_$1_pcfilename="${check_package_prefix}/lib/pkgconfig/pcname.pc"])])
@@ -603,9 +607,14 @@ AC_DEFUN([_OAC_CHECK_PACKAGE_GENERIC_PREFIX], [
 
                   AC_MSG_CHECKING([for $1 library (${check_package_generic_search_lib}) in ${check_package_prefix}])
                   AS_IF([test ${check_package_generic_prefix_lib} -eq 1 -a ${check_package_generic_prefix_lib64} -eq 1],
-                        [AC_MSG_ERROR([Found library $check_package_generic_search_lib in both ${check_package_prefix}/lib and
+                        [AS_IF([test ! -L "${check_package_prefix}/lib" &&
+                                test ! -L "${check_package_prefix}/lib64"],
+                               [AC_MSG_ERROR([Found library $check_package_generic_search_lib in both ${check_package_prefix}/lib and
 ${check_package_prefix}/lib64.  This has confused configure.  Please add --with-$1-libdir=PATH to configure to help
 disambiguate.])],
+                               [check_package_generic_prefix_happy=1
+                                $2_LDFLAGS=-L${check_package_prefix}/lib
+                                AC_MSG_RESULT([found -- lib])])],
                         [test ${check_package_generic_prefix_lib} -eq 1],
                         [check_package_generic_prefix_happy=1
                          $2_LDFLAGS=-L${check_package_prefix}/lib

config/prte_setup_libevent.m4

@@ -6,7 +6,7 @@
 # Copyright (c) 2017-2019 Research Organization for Information Science
 #                         and Technology (RIST).  All rights reserved.
 # Copyright (c) 2020      IBM Corporation.  All rights reserved.
-# Copyright (c) 2021      Nanook Consulting.  All rights reserved.
+# Copyright (c) 2021-2022 Nanook Consulting.  All rights reserved.
 # Copyright (c) 2021-2022 Amazon.com, Inc. or its affiliates.
 #                         All Rights reserved.
 # $COPYRIGHT$
@@ -28,7 +28,7 @@
 #
 # Adds the following to the wrapper compilers:
 #  * CPPFLAGS: none
-#  * LDLFGAS: add prte_libevent_LDFLAGS
+#  * LDFLAGS: add prte_libevent_LDFLAGS
 #  * LIBS: add prte_libevent_LIBS
 AC_DEFUN([PRTE_LIBEVENT_CONFIG],[
     PRTE_VAR_SCOPE_PUSH([prte_event_dir prte_event_libdir prte_check_libevent_save_CPPFLAGS prte_check_libevent_save_LDFLAGS prte_check_libevent_save_LIBS])