Force mboxd to always link with $(CC)

Linking with CXX breaks building on toolchains without c++ support,
even when you point CXX to CC.
Therefore, force always link with CC (it should work even if c++ code is
being linked in).

Makefile.am

@@ -13,6 +13,9 @@ mboxd_SOURCES = \
 	transport_mbox.c \
 	windows.c \
 	mtd.c
+
+mboxd_LINK = $(LINK)
+
 mboxd_LDFLAGS = $(LIBSYSTEMD_LIBS)
 mboxd_CFLAGS = $(LIBSYSTEMD_CFLAGS)
 

README.md

@@ -32,10 +32,10 @@ The build system is a standard autotools setup. `bootstrap.sh` runs all the
 jobs necessary to initialise autotools.
 
 By default mboxd is configured and built _without_ the 'virtual PNOR' feature
-discussed below. The virtual PNOR functionality is written in C++, and due to
-some autotools clunkiness even if it is disabled mboxd will still be linked
-with `CXX`. Point `CXX` to `cc` at configure time if you do not have a C++
-compiler for your target (`./configure CXX=cc`).
+discussed below. The virtual PNOR functionality is written in C++, and in
+prevous versions, due to some autotools clunkiness even if it is disabled mboxd
+will still be linked with `CXX`. This is no longer true. mboxd always links
+with $(CC).
 
 If you are hacking on the reference implementation it's recommended to run
 `bootstrap.sh` with the `dev` argument: