configure: Add hidden --enable-dev-mode to enable all the stuff

Co-authored-by: Elichai Turkel <elichai.turkel@gmail.com>

build-aux/m4/bitcoin_secp.m4

@@ -38,3 +38,16 @@ AC_DEFUN([SECP_TRY_APPEND_CFLAGS], [
   unset flag_works
   AC_SUBST($2)
 ])
+
+dnl SECP_SET_DEFAULT(VAR, default, default-dev-mode)
+dnl Set VAR to default or default-dev-mode, depending on whether dev mode is enabled
+AC_DEFUN([SECP_SET_DEFAULT], [
+  if test "${enable_dev_mode+set}" != set; then
+    AC_MSG_ERROR([[Set enable_dev_mode before calling SECP_SET_DEFAULT]])
+  fi
+  if test x"$enable_dev_mode" = x"yes"; then
+    $1="$3"
+  else
+    $1="$2"
+  fi
+])