mips: update NEWS and README.mips

Patches from Bug #400872 (Add nanoMIPS support to Valgrind) have been
merged.

Update README.mips with a correct configure line applicable for the latest
nanomips toolchain package in public.

Author: petar-jovanovic

NEWS

@@ -1,5 +1,5 @@
 
-Release 3.16.0 (?? ?????? 2019)
+Release 3.16.0 (?? ?????? 2020)
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 3.16.0 is a feature release with many improvements and the usual collection of
@@ -72,6 +72,7 @@ To see details of a given bug, visit
 where XXXXXX is the bug number as listed below.
 
 400593  In Coregrind, use statx for some internal syscalls if [f]stat[64] fail
+400872  Add nanoMIPS support to Valgrind
 404406  s390x: z14 miscellaneous instructions not implemented
 405201  Incorrect size of struct vki_siginfo on 64-bit Linux architectures
 406561  mcinfcallWSRU gdbserver_test fails on ppc64

README.mips

@@ -26,7 +26,7 @@ CFLAGS="-mips64 -mabi=64" will do the trick and compile Valgrind correctly.
  * --host=mips-linux-gnu is necessary if you compile it with cross toolchain
    compiler for big endian platform.
 
- * --host=mipsel-linux-gnu is necessary if you compile it with cross toolchain
+ * --host=mipsel-linux-musl is necessary if you compile it with cross toolchain
    compiler for little endian platform.
 
  * --host=nanomipseb-linux-gnu is necessary if you compile it with cross toolchain