Fix a patch conflict in libc++ tests.

One of our xfailed tests has been fixed, and the patch adding the
xfail comment was causing a conflict.

CMakeLists.txt

@@ -278,7 +278,7 @@ endif()
 # ed551e0778a35f00ab60f1c80d83ea8274d8d400.
 set(
     llvm_project_patches
-    ${CMAKE_CURRENT_SOURCE_DIR}/patches/llvm-project/0001-libc-tests-with-picolibc-xfail-two-remaining-tests.patch
+    ${CMAKE_CURRENT_SOURCE_DIR}/patches/llvm-project/0001-libc-tests-with-picolibc-xfail-one-remaining-test.patch
     ${CMAKE_CURRENT_SOURCE_DIR}/patches/llvm-project/0002-libc-tests-with-picolibc-disable-large-tests.patch
     ${CMAKE_CURRENT_SOURCE_DIR}/patches/llvm-project/0003-Disable-failing-compiler-rt-test.patch
     ${CMAKE_CURRENT_SOURCE_DIR}/patches/llvm-project/0004-libc-tests-with-picolibc-XFAIL-uses-of-atomics.patch

patches/llvm-project/0001-libc-tests-with-picolibc-xfail-one-remaining-test.patch

@@ -0,0 +1,26 @@
+From 1db48238bfbc5324dadf828532a4c67524dc471b Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Dominik=20W=C3=B3jt?= <dominik.wojt@arm.com>
+Date: Mon, 16 Oct 2023 11:35:48 +0200
+Subject: [PATCH] [libc++] tests with picolibc: xfail one remaining test
+
+---
+ .../language.support/support.start.term/quick_exit.pass.cpp    | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/libcxx/test/std/language.support/support.start.term/quick_exit.pass.cpp b/libcxx/test/std/language.support/support.start.term/quick_exit.pass.cpp
+index d8eff69cb5..e16048df72 100644
+--- a/libcxx/test/std/language.support/support.start.term/quick_exit.pass.cpp
++++ b/libcxx/test/std/language.support/support.start.term/quick_exit.pass.cpp
+@@ -17,6 +17,9 @@
+
+ // test quick_exit and at_quick_exit
+
++// TODO: Find out why the at_quick_exit symbol is not found.
++// XFAIL: LIBCXX-PICOLIBC-FIXME
++
+ #include <cstdlib>
+
+ void f() {}
+-- 
+2.34.1
+