meson: turn on NO_MMAP when building with LSan

The previous commit taught the Makefile to turn on NO_MMAP in this
instance. We should do the same with meson for consistency. We already
do this for ASan builds, so we can just tweak one conditional.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

meson.build

@@ -1417,7 +1417,7 @@ else
     'getpagesize' : [],
   }
 
-  if get_option('b_sanitize').contains('address')
+  if get_option('b_sanitize').contains('address') or get_option('b_sanitize').contains('leak')
     libgit_c_args += '-DNO_MMAP'
     libgit_sources += 'compat/mmap.c'
   else