toolchain: gcc: improve patch handling by introducing major version

Every minor version bump of a major version will result in a huge patch
diff because of the moving of all the patches from version e.g. 11.2.0 to
11.3.0. This commit only use the major version for the patch folders to
differentiate between the different gcc versions. This will significantly
improve the reviewing of the smaller version bump patches and help to see
what really changed in a minor version bump.

Signed-off-by: Nick Hainke <vincent@systemli.org>

toolchain/gcc/common.mk

@@ -23,6 +23,7 @@ include $(TOPDIR)/rules.mk
 PKG_NAME:=gcc
 GCC_VERSION:=$(call qstrip,$(CONFIG_GCC_VERSION))
 PKG_VERSION:=$(firstword $(subst +, ,$(GCC_VERSION)))
+GCC_MAJOR_VERSION:=$(word 1,$(subst ., ,$(PKG_VERSION)))
 GCC_DIR:=$(PKG_NAME)-$(PKG_VERSION)
 
 PKG_SOURCE_URL:=@GNU/gcc/gcc-$(PKG_VERSION)
@@ -44,7 +45,7 @@ ifeq ($(PKG_VERSION),12.2.0)
   PKG_HASH:=e549cf9cf3594a00e27b6589d4322d70e0720cdd213f39beb4181e06926230ff
 endif
 
-PATCH_DIR=../patches/$(GCC_VERSION)
+PATCH_DIR=../patches-$(GCC_MAJOR_VERSION).x
 
 BUGURL=http://bugs.openwrt.org/
 PKGVERSION=OpenWrt GCC $(PKG_VERSION) $(REVISION)