Fix tag format errors

v0.0.0 vs vv0.0.0 vs 0.0.0

src/include/release.sh

@@ -39,7 +39,7 @@ __die_if() {
         old_c)
             x=$(__ver_info nextver_g)
             __ver_info currver_c \
-              | grep -qFx "$x" config.mk \
+              | grep -qFx "$x" \
              || die "new version not in config.mk: $x"
             ;;
     esac
@@ -63,7 +63,7 @@ __ver_info() {
     #
     local info="$1"
     case "$info" in
-        lastver_g)  __git_info lasttag | sed s/v$// ;;
+        lastver_g)  __git_info lasttag | sed s/^v// ;;
         nextver_g)  __make_ver "$level" "$(__ver_info lastver_g)" ;;
         currver_c)  grep -m 1 -w VERSION config.mk \
                      | sed 's/ *= */=/' | cut -d = -f 2 | xargs echo ;;