build: Fix out-of-tree build with json ext

If building out-of-tree, the jsmn/ directory may not exist.
So create it during configure

Signed-off-by: Steve Bennett <steveb@workware.net.au>

1 files changed, 2 insertions, 0 deletions

diff --git a/auto.def b/auto.def
index 893c93a..615f157 100644
--- a/auto.def
+++ b/auto.def
@@ -468,6 +468,8 @@ if {$jimregexp || [opt-bool jim-regexp]} {
 foreach mod $extinfo(static-c) {
     if {[dict exists $extdb info $mod extrasrcs]} {
         foreach src [dict get $extdb info $mod extrasrcs] {
+            # In case we are building out-of-tree and $src is in a subdir
+            file mkdir [file dirname $src]
             lappend extra_objs {*}[file rootname $src].o
         }
     }