Rewrite autotools build system (new configure.ac, changes for various

Makefile.am and fixed m4 scripts). Could still need some fixes.

zlib/Makefile.am

@@ -1,13 +1,29 @@
-if ENABLE_SHIPPED_ZLIB
-# no indent here! - BSD make issue
+if WITH_SHIPPED_ZLIB
 noinst_LTLIBRARIES = libzlib.la
 endif
 
-libzlib_la_SOURCES = adler32.c compress.c crc32.c deflate.c \
-gzio.c infback.c inffast.c inflate.c \
-inftrees.c trees.c uncompr.c zutil.c
+libzlib_la_SOURCES = \
+  adler32.c   \
+  compress.c  \
+  crc32.c     \
+  deflate.c   \
+  gzio.c      \
+  infback.c   \
+  inffast.c   \
+  inflate.c   \
+  inftrees.c  \
+  trees.c     \
+  uncompr.c   \
+  zutil.c
 
 noinst_HEADERS = \
-crc32.h deflate.h inffast.h \
-inffixed.h inflate.h inftrees.h \
-trees.h zconf.h zlib.h zutil.h 
+  crc32.h     \
+  deflate.h   \
+  inffast.h   \
+  inffixed.h  \
+  inflate.h   \
+  inftrees.h  \
+  trees.h     \
+  zconf.h     \
+  zlib.h      \
+  zutil.h