add --disable-mmap option, and tests for sys/mman.h and mmap

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@11360 ec53bebd-3082-4978-b11e-865c3cabbd6b

configure.in

@@ -193,6 +193,12 @@ rk_OTP
 
 AC_CHECK_OSFC2
 
+AC_ARG_ENABLE(mmap,
+	AC_HELP_STRING([--disable-mmap],[disable use of mmap]))
+if test "$enable_mmap" = "no"; then
+	AC_DEFINE(NO_MMAP, 1, [Define if you don't want to use mmap.])
+fi
+
 rk_CHECK_MAN
 
 rk_TEST_PACKAGE(readline,
@@ -256,6 +262,7 @@ AC_CHECK_HEADERS([\
 	sys/file.h				\
 	sys/filio.h				\
 	sys/ioccom.h				\
+	sys/mman.h				\
 	sys/pty.h				\
 	sys/ptyio.h				\
 	sys/ptyvar.h				\
@@ -327,6 +334,8 @@ AC_CHECK_FUNCS([				\
 	yp_get_default_domain			\
 ])
 
+AC_FUNC_MMAP
+
 KRB_CAPABILITIES
 
 AC_CHECK_GETPWNAM_R_POSIX