added cmake module to find libzip

cmake/FindLibZip.cmake

@@ -0,0 +1,72 @@
+# Locate libzip
+# This module defines
+# LIBZIP_LIBRARY
+# LIBZIP_FOUND, if false, do not try to link to libzip
+# LIBZIP_INCLUDE_DIR, where to find the headers
+#
+
+FIND_PATH(LIBZIP_INCLUDE_DIR zip.h
+$ENV{LIBZIP_DIR}/include
+$ENV{LIBZIP_DIR}
+$ENV{OSGDIR}/include
+$ENV{OSGDIR}
+$ENV{OSG_ROOT}/include
+$ENV{PROGRAMFILES}/libzip/include
+~/Library/Frameworks
+/Library/Frameworks
+/usr/local/include
+/usr/include
+/sw/include # Fink
+/opt/local/include # DarwinPorts
+/opt/csw/include # Blastwave
+/opt/include
+[HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Control\\Session\ Manager\\Environment;OSG_ROOT]/include
+/usr/freeware/include
+)
+
+FIND_LIBRARY(LIBZIP_LIBRARY
+NAMES libzip zip
+PATHS
+$ENV{LIBZIP_DIR}/lib
+$ENV{LIBZIP_DIR}
+$ENV{OSGDIR}/lib
+$ENV{OSGDIR}
+$ENV{OSG_ROOT}/lib
+$ENV{PROGRAMFILES}/libzip/lib
+~/Library/Frameworks
+/Library/Frameworks
+/usr/local/lib
+/usr/lib
+/sw/lib
+/opt/local/lib
+/opt/csw/lib
+/opt/lib
+[HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Control\\Session\ Manager\\Environment;OSG_ROOT]/lib
+/usr/freeware/lib64
+)
+
+FIND_PATH(LIBZIP_CONF_INCLUDE_DIR zipconf.h
+$ENV{LIBZIP_DIR}/include
+$ENV{LIBZIP_DIR}
+$ENV{OSGDIR}/include
+$ENV{OSGDIR}
+$ENV{OSG_ROOT}/include
+$ENV{PROGRAMFILES}/libzip/include
+$ENV{PROGRAMFILES}/libzip/lib/libzip/include
+~/Library/Frameworks
+/Library/Frameworks
+/usr/local/include
+/usr/include
+/sw/include # Fink
+/opt/local/include # DarwinPorts
+/opt/csw/include # Blastwave
+/opt/include
+[HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Control\\Session\ Manager\\Environment;OSG_ROOT]/include
+/usr/freeware/include
+)
+
+
+SET(LIBZIP_FOUND "NO")
+IF(LIBZIP_LIBRARY AND LIBZIP_INCLUDE_DIR)
+SET(LIBZIP_FOUND "YES")
+ENDIF(LIBZIP_LIBRARY AND LIBZIP_INCLUDE_DIR)