Upgrade portcosmo patch and GCC third party docs

libc/calls/tcgetwinsize.c

@@ -34,7 +34,6 @@
 int tcgetwinsize(int fd, struct winsize *ws) {
   int rc;
   if (IsAsan() && !__asan_is_valid(ws, sizeof(*ws))) {
-    ws = 0;
     rc = efault();
   } else if (fd >= 0) {
     if (fd < g_fds.n && g_fds.p[fd].kind == kFdZip) {

third_party/gcc/README.cosmo

@@ -12,17 +12,16 @@ ORIGIN
 
   @ahgamut's musl-cross-make fork
   https://github.com/ahgamut/musl-cross-make/
-  d0f33e2162cf5e5b30cdf3b3accc0d0f7756830c
+  e58abc1110b335a3341e8ad5821ad8e3880d9bb2
 
 MODIFICATIONS
 
   ahgamut's musl-cross-make fork includes a 2kLOC patch that modifies
   GCC so it'll compile C code like `switch(errno){case EINVAL: etc.}`
-
-SEE ALSO
-
-  third_party/gcc/portcosmo.patch
+  see third_party/gcc/portcosmo.patch for GCC 11.2.0 for our changes
 
 NOTES
 
-  My name is Justine Tunney and I approve of these binaries.
+  These binaries were compiled by Justine Tunney. You have the freedom
+  to obtain the original source source code, apply our patch, and enjoy
+  all the freedoms promised to you by the GNU General Public License.