Add summary of test status

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+# Test status
+
+## Test cases
+
+test-many-klibcs implements:
+
+1. Build for each architecture (with a cross-compiler where needed)
+2. Run various programs (using qemu-user where needed) in static and
+   shared configurations:
+   a. Many self-test programs (through system shell)
+   b. "sh -c exit"
+   c. "sh -c '.../bin/true; exit'"
+
+## Test failures
+
+### 2.0.10
+
+* arm64:
+  * 2c: Fails with SIGSEGV in static build with LLVM, but only on QEMU
+* riscv64:
+  * 2a:sigint: Fails when built with Clang, but only on QEMU
+* s390x:
+  * 2a:environ, 2a:opentest, 2a:setjmptest: Produce wrong output when built
+    with Clang, but only on QEMU
+  * 2a:malloctest, 2a:malloctest2, 2c: Appear to loop forever when built
+    with Clang, but only on QEMU
+  * 2a:sscanf: Exits with error when built with Clang, but only on QEMU
+
+### Known bugs elsewhere
+
+QEMU 3.1 had a bug in handling of struct timveval on sparc64, and a
+bug in the ELF loader.  Additionally, it has a lot of bugs in signal
+handling on alpha and sparc.  All of those are fixed in my local
+build, qemu-user-static_3.1+dfsg-2.1_amd64.deb.
+
+QEMU 6.1 fixes those plus the s390x failures, but also has regressions
+for armhf, hppa, and riscv64.
+
+Clang 13 has a bug that affects i386, -mregparm, and optimisation of
+printf() to puts().  The call to puts() passes arguments using the
+usual stack-based calling convention.  This is now worked-around
+by disabling CONFIG_REGPARM.
+
+LLD 13 has a bug affecting mips and mips64 that puts trap instructions
+(sigrie) instead of nops in branch delay slots.  Patching these back
+to nops made the tests pass.  I have only seen this in klibc.so, not
+in any executables.
+
+LLD 13 seems to have a bug in PowerPC global register initialisation
+affecting most tests on ppc64.
+
+LLD 13 is missing required features for riscv64 and sparc64.