Note that 2001/bellard only works for i386 linux

The author stated this directly. It is noted in the bugs.md file and the
README.

I also included a suggested change by Yusuke Endoh. This is not
necessary for compilers that support -Wl,-z,execstack but not all
compilers do (though the only one I've found that has this problem is
macOS which it won't work under anyway just like -m32 won't which we
also now use).

Added the 'more portable' version by the author. This does not compile
at least under 64-bit linux (not macOS either though of course it
wouldn't work in macOS as if you look at the code you see hardcoded
paths for linux ld-linux.so).

I note that there's a de-obfuscated version on the author's page for the
entry which might give some clues. I might look at it in the future but
it appears that unless someone can provide a 64-bit linux version this
will be one of the entries (now far fewer with many fixes made) that
simply no longer work.

This thus completes for now 2001/bellard even with disappointing
circumstances.

2001/bellard/Makefile

@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= #-Wno-bitwise-op-parentheses -Wno-error -Wno-implicit-function-declaration \
+CSILENCE= -Wno-bitwise-op-parentheses -Wno-error -Wno-implicit-function-declaration \
 	-Wno-implicit-int -Wno-int-conversion -Wno-int-to-pointer-cast \
 	-Wno-parentheses -Wno-return-type
 
@@ -55,7 +55,7 @@ CSTD= -std=gnu99
 # Some entries require 32-bitness: ARCH= -m32
 # Some entries require 64-bitness: ARCH= -m64
 #
-ARCH=
+ARCH= -m32
 
 # Defines that are needed to compile
 #
@@ -71,7 +71,7 @@ OPT= -O3
 
 # Default flags for ANSI C compilation
 #
-CFLAGS= ${CSTD} ${CWARN} ${ARCH} ${CDEFINE} ${CINCLUDE} ${OPT} -rdynamic
+CFLAGS= ${CSTD} ${CWARN} ${ARCH} ${CDEFINE} ${CINCLUDE} ${OPT} -rdynamic -fno-pie
 
 # Libraries needed to build
 #