package/gcc, .checkpackageignore: fix warnings about gcc 13.2.0 patches

Patch 0001 is an old patch we have been carrying forever, and it has
no upstream status.

Patch 0002 is upstream, add proper upstream tag.

Fixes:

package/gcc/13.2.0/0001-disable-split-stack-for-non-thread-builds.patch:0: missing Upstream in the header (http://nightly.buildroot.org/#_additional_patch_documentation)
package/gcc/13.2.0/0002-RISC-V-fix-build-issue-with-gcc-4.9.x.patch:0: missing Upstream in the header (http://nightly.buildroot.org/#_additional_patch_documentation)

In:

https://gitlab.com/buildroot.org/buildroot/-/jobs/4763535592

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

.checkpackageignore

@@ -490,6 +490,7 @@ package/gamin/0003-fix-missing-PTHREAD_MUTEX_RECURSIVE_NP.patch Upstream
 package/gcc/11.4.0/0001-or1k-Add-mcmodel-option-to-handle-large-GOTs.patch Upstream
 package/gcc/11.4.0/0004-disable-split-stack-for-non-thread-builds.patch Upstream
 package/gcc/12.3.0/0001-disable-split-stack-for-non-thread-builds.patch Upstream
+package/gcc/13.2.0/0001-disable-split-stack-for-non-thread-builds.patch Upstream
 package/gcc/8.4.0/0001-xtensa-fix-PR-target-91880.patch Upstream
 package/gcc/8.4.0/0002-Revert-re-PR-target-92095-internal-error-with-O1-mcp.patch Upstream
 package/gcc/8.4.0/0003-libsanitizer-Remove-cyclades-from-libsanitizer.patch Upstream

package/gcc/13.2.0/0002-RISC-V-fix-build-issue-with-gcc-4.9.x.patch

@@ -21,7 +21,7 @@ gcc/ChangeLog:
 	the namespace.
 
 Signed-off-by: Romain Naour <romain.naour@gmail.com>
-(cherry picked from commit 87c347c2897537a6aa391efbfc5ed00c625434fe)
+Upstream: https://gcc.gnu.org/git/gitweb.cgi?p=gcc.git;h=87c347c2897537a6aa391efbfc5ed00c625434fe
 Signed-off-by: Romain Naour <romain.naour@gmail.com>
 ---
  gcc/config/riscv/genrvv-type-indexer.cc | 4 ++--