modula-2: Fix building the plugin for Darwin [PR107612].

 * Makes the configured value for INCINTL available as a variable so that
it can be used in language makefile fragements.  It is then used in the m2
fragment to make the include path available to the plugin compile.

 * Updates the DSO suffix  to use .dylib for Darwin.

 * Adds '-Wl,-undefined,dynamic_lookup' to the link flags so that symbols can
   be resolved at runtime.

 * Removes the extraneous $(exeext) from the DSO names.

Since the linking is driven by CXX, we also need to supress the addition of
default libraries otherwise:
 (1) we will get a reference to an uninstalled libstdc++
 (2) the process opening the plugin would have two instances 0f libstdc++ -
     one statically linked into gm2 and one dynamically linked into the plugin.

	PR modula2/107612

gcc/ChangeLog:

	* Makefile.in: Make the configured libintl includes avaiable in INCINTL.
	(BUILD_CPPFLAGS): Use INCINTL.

gcc/m2/ChangeLog:

	* Make-lang.in (soext): Use .dylib for Darwin.
	(PLUGINLDFLAGS): Use dynmic lookup, set the plugin name, and append
	-nodefaultlibs to suppress the linking of libstdc++.
	Use INCINTL in compile lines for the plugin.

Co-Authored-By: Iain Sandoe <iain@sandoe.co.uk>

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