* ltmain.in: Add new qnx version type support.

* ltmain.in: Add new qnx version type support.
* m4/libtool.m4 (AC_LIBTOOL_SYS_DYNAMIC_LINKER): Use it.  Set
ldqnx.so linker type.
(AC_DEPLIBS_CHECK_METHOD): QNX6 uses GNU C++, with deplib
checking, so use pass_all.
(AC_LIBTOOL_PROG_COMPILER_PIC): Use -shared for QNX.
(_LT_LANG_CXX_CONFIG): QNX can make shared libraries.
* m4/ltdl.m4 (AC_LTDL_SYS_DLOPEN_DEPLIBS): QNX opens deplibs on
dlopen.
* NEWS: Updated.