toolchain/gcc: remove upstreamed patch, add backport

This patch has been upstream since GCC 10.
Dragan Mladjenovic (2):
      Emit .note.GNU-stack for soft-float linux targets.
      Emit .note.GNU-stack for hard-float linux targets.

Link: https://gcc.gnu.org/g:a3c1e1f2ff88
Link: https://gcc.gnu.org/g:54b3d52c3cca

Add backport patch to define TARGET_LIBC_GNUSTACK on musl to add
.note.GNU-stack on hard-float MIPS targets.

Link: https://gcc.gnu.org/g:25abbb924968

The net effect should be the exact same functionality while following
upstream code instead of a custom outdated patch.

Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>

toolchain/gcc/patches/11.2.0/011-v12-configure-define-TARGET_LIBC_GNUSTACK-on-musl.patch

@@ -0,0 +1,46 @@
+From ea650cae26da4a8fc04f0c4666f4dd776d0b5fc0 Mon Sep 17 00:00:00 2001
+From: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
+Date: Sun, 14 Nov 2021 21:54:25 -0800
+Subject: [PATCH] configure: define TARGET_LIBC_GNUSTACK on musl
+
+musl only uses PT_GNU_STACK to set default thread stack size and has no
+executable stack support[0], so there is no reason not to emit the
+.note.GNU-stack section on musl builds.
+
+[0]: https://lore.kernel.org/all/20190423192534.GN23599@brightrain.aerifal.cx/T/#u
+
+gcc/ChangeLog:
+
+	* configure: Regenerate.
+	* configure.ac: define TARGET_LIBC_GNUSTACK on musl
+
+Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
+---
+ gcc/configure    | 3 +++
+ gcc/configure.ac | 3 +++
+ 2 files changed, 6 insertions(+)
+
+--- a/gcc/configure
++++ b/gcc/configure
+@@ -30954,6 +30954,9 @@ fi
+ # Check if the target LIBC handles PT_GNU_STACK.
+ gcc_cv_libc_gnustack=unknown
+ case "$target" in
++  mips*-*-linux-musl*)
++    gcc_cv_libc_gnustack=yes
++    ;;
+   mips*-*-linux*)
+
+ if test $glibc_version_major -gt 2 \
+--- a/gcc/configure.ac
++++ b/gcc/configure.ac
+@@ -6788,6 +6788,9 @@ fi
+ # Check if the target LIBC handles PT_GNU_STACK.
+ gcc_cv_libc_gnustack=unknown
+ case "$target" in
++  mips*-*-linux-musl*)
++    gcc_cv_libc_gnustack=yes
++    ;;
+   mips*-*-linux*)
+     GCC_GLIBC_VERSION_GTE_IFELSE([2], [31], [gcc_cv_libc_gnustack=yes], )
+     ;;