weechat: fix recursive Kconfig dependency

weechat-full conflicts with weechat-minimal, so weechat-full can only
be built in if weechat-minimal is not. luci-app-weechat depends on the
virtual weechat and selects the default variant weechat-minimal unless
weechat-full is selected. Together this is a recursive dependency:

  PACKAGE_luci-app-weechat depends on PACKAGE_weechat-full
  PACKAGE_weechat-full depends on PACKAGE_weechat-minimal
  PACKAGE_weechat-minimal is selected by PACKAGE_luci-app-weechat

It also keeps weechat-full out of any image with luci-app-weechat,
because the selected weechat-minimal wins.

Move the conflict to the default variant weechat-minimal. The build
system does the same since openwrt.git commit 6d5c71f748 ("build:
auto-generate CONFLICTS for package variants sharing PROVIDES"), but
only if the other variant does not declare the conflict itself. Keep
it explicit for branches without that commit, like openwrt-25.12.

Reported-by: Hannu Nyman <hannu.nyman@iki.fi>
Suggested-by: Mario Andrés Pérez <mapb_@outlook.com>
Signed-off-by: Josef Schlehofer <pepe.schlehofer@gmail.com>

net/weechat/Makefile

@@ -7,7 +7,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=weechat
 PKG_VERSION:=4.10.1
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=https://weechat.org/files/src/
@@ -63,6 +63,7 @@ define Package/weechat-minimal
   VARIANT:=minimal
   DEFAULT_VARIANT:=1
   PROVIDES:=weechat
+  CONFLICTS:=weechat-full
 endef
 
 define Package/weechat-minimal/description
@@ -76,7 +77,6 @@ define Package/weechat-full
   DEPENDS+= +libncurses
   VARIANT:=full
   PROVIDES:=weechat
-  CONFLICTS:=weechat-minimal
 endef
 
 define Package/weechat-full/description