patch 9.0.0108: configure check for timer_create may give wrong error

Problem:    Configure check for timer_create may give wrong error.
Solution:   Give a warning instead of an error.
diff --git a/src/auto/configure b/src/auto/configure
index 1fd75e2..1883611 100755
--- a/src/auto/configure
+++ b/src/auto/configure
@@ -13044,7 +13044,8 @@
 else
 
 if test "$cross_compiling" = yes; then :
-  as_fn_error $? "cross-compiling: please set 'vim_cv_timer_create'" "$LINENO" 5
+  { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: failed to build test program; if cross-compiling please set 'vim_cv_timer_create'" >&5
+$as_echo "$as_me: WARNING: failed to build test program; if cross-compiling please set 'vim_cv_timer_create'" >&2;}
 
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
@@ -13098,7 +13099,8 @@
 else
 
     if test "$cross_compiling" = yes; then :
-  as_fn_error $? "cross-compiling: please set 'vim_cv_timer_create_with_lrt'" "$LINENO" 5
+  { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: failed to build test program; if cross-compiling please set 'vim_cv_timer_create_with_lrt'" >&5
+$as_echo "$as_me: WARNING: failed to build test program; if cross-compiling please set 'vim_cv_timer_create_with_lrt'" >&2;}
 
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
diff --git a/src/configure.ac b/src/configure.ac
index d777b05..76eb563 100644
--- a/src/configure.ac
+++ b/src/configure.ac
@@ -3828,7 +3828,7 @@
   ])],
   vim_cv_timer_create=yes,
   vim_cv_timer_create=no,
-  AC_MSG_ERROR(cross-compiling: please set 'vim_cv_timer_create')
+  AC_MSG_WARN([failed to build test program; if cross-compiling please set 'vim_cv_timer_create'])
   )])
 
 dnl If the previous failed, check for timer_create() and linking with -lrt.
@@ -3856,7 +3856,7 @@
       ])],
       vim_cv_timer_create_with_lrt=yes,
       vim_cv_timer_create_with_lrt=no,
-      AC_MSG_ERROR(cross-compiling: please set 'vim_cv_timer_create_with_lrt')
+      AC_MSG_WARN([failed to build test program; if cross-compiling please set 'vim_cv_timer_create_with_lrt'])
     )])
   LIBS="$save_LIBS"
 else
diff --git a/src/version.c b/src/version.c
index 79802aa..80bd894 100644
--- a/src/version.c
+++ b/src/version.c
@@ -736,6 +736,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    108,
+/**/
     107,
 /**/
     106,