Disable bzip2 tests when cross compiling on Windows to avoid this error:

> Doing 6 tests (3 compress, 3 uncompress) ...
> If there's a problem, things might stop at this point.
> 
> 	.\\bzip2 -1  < sample1.ref > sample1.rb2
> This version of C:\sources\libo-core\workdir\UnpackedTarball\bzip2\bzip2.exe is not compatible with the version of Windows you're running.
> Check your computer's system information and then contact the software publisher.
> NMAKE : fatal error U1077: '.\\bzip2' : return code '0x1'
> Stop.

--- makefile.msc.orig	2019-07-14 02:50:05.000000000 +0900
+++ makefile.msc	2023-09-20 20:00:14.124370100 +0900
@@ -14,7 +14,7 @@
       decompress.obj \
       bzlib.obj
 
-all: lib bzip2 test
+all: lib bzip2
 
 bzip2: lib
 	$(CC) $(CFLAGS) -o bzip2 bzip2.c libbz2.lib setargv.obj
@@ -23,26 +23,6 @@
 lib: $(OBJS)
 	lib /out:libbz2.lib $(OBJS)
 
-test: bzip2
-	type words1
-	.\\bzip2 -1  < sample1.ref > sample1.rb2
-	.\\bzip2 -2  < sample2.ref > sample2.rb2
-	.\\bzip2 -3  < sample3.ref > sample3.rb2
-	.\\bzip2 -d  < sample1.bz2 > sample1.tst
-	.\\bzip2 -d  < sample2.bz2 > sample2.tst
-	.\\bzip2 -ds < sample3.bz2 > sample3.tst
-	@echo All six of the fc's should find no differences.
-	@echo If fc finds an error on sample3.bz2, this could be
-	@echo because WinZip's 'TAR file smart CR/LF conversion'
-	@echo is too clever for its own good.  Disable this option.
-	@echo The correct size for sample3.ref is 120,244.  If it
-	@echo is 150,251, WinZip has messed it up.
-	fc sample1.bz2 sample1.rb2 
-	fc sample2.bz2 sample2.rb2
-	fc sample3.bz2 sample3.rb2
-	fc sample1.tst sample1.ref
-	fc sample2.tst sample2.ref
-	fc sample3.tst sample3.ref