more adhoc patching of CMakeLists.txt

This happens often, and it's structure is known well enough to be
processed with sed.

0.10.0-961-g54160e7f6a-CMakeLists.txt-remove-stage3.patch

@@ -1,39 +0,0 @@
-From fb173ca3a0cd07789dbd7c71a8e9350eef630352 Mon Sep 17 00:00:00 2001
-From: motiejus <foo@bar>
-Date: Wed, 6 Nov 2024 20:42:27 +0000
-Subject: [PATCH] 0.10.0-961-g54160e7f6a: CMakeLists.txt: remove stage3
-
----
- CMakeLists.txt | 19 -------------------
- 1 file changed, 19 deletions(-)
-
-diff --git a/CMakeLists.txt b/CMakeLists.txt
-index 997bfd51f6..4ea143bce7 100644
---- a/CMakeLists.txt
-+++ b/CMakeLists.txt
-@@ -862,22 +862,3 @@ set(ZIG_BUILD_ARGS
-   "-Dcpu=${ZIG_TARGET_MCPU}"
-   "-Dversion-string=${RESOLVED_ZIG_VERSION}"
- )
--
--add_custom_target(stage3 ALL
--  COMMAND zig2 build compile ${ZIG_BUILD_ARGS}
--  DEPENDS zig2
--  COMMENT STATUS "Building stage3"
--  WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
--)
--
--if(WIN32)
--  set(ZIG_EXECUTABLE "${CMAKE_BINARY_DIR}/zig2.exe")
--else()
--  set(ZIG_EXECUTABLE "${CMAKE_BINARY_DIR}/zig2")
--endif()
--
--install(CODE "set(ZIG_EXECUTABLE \"${ZIG_EXECUTABLE}\")")
--install(CODE "set(ZIG_BUILD_ARGS \"${ZIG_BUILD_ARGS}\")")
--install(CODE "set(CMAKE_INSTALL_PREFIX \"${CMAKE_INSTALL_PREFIX}\")")
--install(CODE "set(CMAKE_SOURCE_DIR \"${CMAKE_SOURCE_DIR}\")")
--install(SCRIPT "${CMAKE_SOURCE_DIR}/cmake/install.cmake")
--- 
-2.39.5
-

run

@@ -13,6 +13,7 @@ fullbuild() {
 
 # zig2
 halfbuild() {
+  sed -i  '/^add_custom_target(stage3/,/^)$/d' CMakeLists.txt
   rm -fr build
   mkdir build
   pushd build
@@ -220,7 +221,6 @@ step07() {
   git archive --prefix=zig-$STEP07_/ $STEP07 | tar -C .. -x
   {
     pushd "../zig-$STEP07_"
-    patch -p1 <"$HERE/0.10.0-961-g54160e7f6a-CMakeLists.txt-remove-stage3.patch"
     cp ../zig-$STEP06_/stage1/zig1.wasm stage1/zig1.wasm
     halfbuild
     popd
@@ -362,7 +362,6 @@ step14() {
   git archive --prefix=zig-$STEP14_/ $STEP14 | tar -C .. -x
   {
     pushd "../zig-$STEP14_"
-    patch -p1 <"$HERE/0.10.0-1657-g321ccbdc52-CMakeLists.txt-remove-stage3.patch"
     cp ../zig-$STEP13_/stage1/zig1.wasm stage1/zig1.wasm
     halfbuild
     popd
@@ -402,7 +401,6 @@ step16() {
   {
     pushd "../zig-$STEP16_"
     cp ../zig-$STEP15_/stage1/zig1.wasm stage1/zig1.wasm
-    patch -p1 <"$HERE/0.10.0-1657-g321ccbdc52-CMakeLists.txt-remove-stage3.patch"
     halfbuild
     popd
   }