readline: Update to version 8.2-001. * src/readline.mk: Update version and checksum. * src/readline-0-001-upstream.patch: Upstream patch re-formatted to apply in MXE Octave. See: https://ftp.gnu.org/pub/gnu/readline/readline-8.2-patches/readline82-001 * src/readline-0-002-upstream.patch: Remove upstream patch for previous version. * src/readline-1-input.patch, src/readline-1-sigwinch.patch: Update patches. * src/readline-3-fd_set.patch: Add patch to guard functions that use types that aren't available on Windows. * src/gdb-1-readline-8.2.patch: Cherry-pick upstream patch. * dist-files.mk: Update files in list.

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Insist that ssize_t is defined.

diff --git a/util/cairo-missing/cairo-missing.h b/util/cairo-missing/cairo-missing.h
index 7e4f0a3..c20b869 100644
--- a/util/cairo-missing/cairo-missing.h
+++ b/util/cairo-missing/cairo-missing.h
@@ -37,6 +37,8 @@
 #include <string.h>
 #include <sys/types.h>
 
+#define _SSIZE_T_DEFINED 1
+
 #ifdef _WIN32
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>