made the pack completely portable and wrote relevent bat files to go with it

gitportable/mingw64/share/doc/xz/examples/Makefile

@@ -0,0 +1,21 @@
+# SPDX-License-Identifier: 0BSD
+# Author: Lasse Collin
+
+CC = c99
+CFLAGS = -g
+LDFLAGS = -llzma
+
+PROGS = \
+	01_compress_easy \
+	02_decompress \
+	03_compress_custom \
+	04_compress_easy_mt \
+	11_file_info
+
+all: $(PROGS)
+
+.c:
+	$(CC) $(CFLAGS) -o $@ $< $(LDFLAGS)
+
+clean:
+	-rm -f $(PROGS)