unpack zips in src to better compression

sources/z-tools/trunk/prerequisites.txt

@@ -0,0 +1,18 @@
+Current zTools are verified to work / compile with:
+
+- freetype 2.4.6
+- gemlib (latest from CVS)
+- ldg (latest SVN plus fix for memory protection)
+- libmem (same source as ldg)
+- libshare 0.1.1
+- libxml 2.3.11
+- mintlib (latest CVS)
+- pml 2.03 (from Vincent's gcc4 port)
+- transprt.h (STiK/STinG header file, available from http://mikro.atari.org)
+- windom 1.21.3 (plus fix for gcc4 and memory protection) [zView, current zWeather]
+- windom (latest from CVS) [zTask, zWeather in future release]
+- xpdf 3.03
+- zlib 1.2.5
+
+Compiler used for development is gcc / g++ 4.6.x with binutils 2.21, CFLAGS
+and CXXFLAGS for all components are '-m68060-20 -O2 -fomit-frame-pointer'.