Update bugs and thanks for 1992/lush

I also removed a -Wno- option from the Makefile as the entry relies on
this warning. This is not strictly necessary as the script that I added,
runme.sh, directly compiles it, but it felt like it shouldn't have it
anyway.

In the bugs.md file I gave some hints as to why this does not work with
clang.

In the thanks file I broke up a paragraph into more than one paragraph.

1992/lush/Makefile

@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-macro-redefined \
+CSILENCE= -Wno-error -Wno-implicit-function-declaration \
 	-Wno-strict-prototypes
 
 # Common C compiler warning flags