Ensure that the pmix headers and lib get installed when --with-devel-headers is given so that PMIx applications can be built and executed against the "embedded" PMIx version

Signed-off-by: Ralph Castain <rhc@open-mpi.org>

opal/mca/pmix/pmix2x/configure.m4

@@ -49,14 +49,15 @@ AC_DEFUN([MCA_opal_pmix_pmix2x_CONFIG],[
         opal_pmix_pmix2x_sm_flag=--disable-dstore
     fi
 
-    opal_pmix_pmix2x_args="--enable-embedded-mode --with-pmix-symbol-rename=OPAL_MCA_PMIX2X_ $opal_pmix_pmix2x_sm_flag --without-tests-examples --disable-visibility --enable-embedded-libevent --with-libevent-header=\\\"opal/mca/event/$opal_event_base_include\\\""
+    opal_pmix_pmix2x_args="--with-pmix-symbol-rename=OPAL_MCA_PMIX2X_ $opal_pmix_pmix2x_sm_flag --without-tests-examples --disable-visibility --enable-embedded-libevent --with-libevent-header=\\\"opal/mca/event/$opal_event_base_include\\\""
     AS_IF([test "$enable_debug" = "yes"],
           [opal_pmix_pmix2x_args="--enable-debug $opal_pmix_pmix2x_args"
            CFLAGS="$OPAL_CFLAGS_BEFORE_PICKY $OPAL_VISIBILITY_CFLAGS -g"],
           [opal_pmix_pmix2x_args="--disable-debug $opal_pmix_pmix2x_args"
            CFLAGS="$OPAL_CFLAGS_BEFORE_PICKY $OPAL_VISIBILITY_CFLAGS"])
-    AS_IF([test "$with_devel_headers" = "yes"], [],
-          [opal_pmix_pmix2x_args="--with-devel-headers $opal_pmix_pmix2x_args"])
+    AS_IF([test "$with_devel_headers" = "yes"],
+          [opal_pmix_pmix2x_args="--with-devel-headers $opal_pmix_pmix2x_args"],
+          [opal_pmix_pmix2x_args="--enable-embedded-mode $opal_pmix_pmix2x_args"])
     CPPFLAGS="-I$OPAL_TOP_SRCDIR -I$OPAL_TOP_BUILDDIR -I$OPAL_TOP_SRCDIR/opal/include -I$OPAL_TOP_BUILDDIR/opal/include $CPPFLAGS"
 
     OPAL_CONFIG_SUBDIR([$opal_pmix_pmix2x_basedir/pmix],