Suppress versioning for modules, tell libtool they are modules

Versioning is for libraries. Modules are not libraries; no code is linked
against them.

Libtool makes sure the modules can be opened by dlopen(). That is already
true for ELF format, but other file formats may need special processing.

mc/Makefile.am

@@ -18,3 +18,5 @@ libmc_la_SOURCES = \
 
 libmc_la_LIBADD = \
   $(top_builddir)/common/libcommon.la
+
+libmc_la_LDFLAGS = -avoid-version -module

neutrinordp/Makefile.am

@@ -22,3 +22,5 @@ libxrdpneutrinordp_la_SOURCES = \
 libxrdpneutrinordp_la_LIBADD = \
   $(top_builddir)/common/libcommon.la \
   $(FREERDP_LIBS)
+
+libxrdpneutrinordp_la_LDFLAGS = -avoid-version -module

rdp/Makefile.am

@@ -26,3 +26,5 @@ librdp_la_SOURCES = \
 
 librdp_la_LIBADD = \
   $(top_builddir)/common/libcommon.la
+
+librdp_la_LDFLAGS = -avoid-version -module

vnc/Makefile.am

@@ -18,3 +18,5 @@ libvnc_la_SOURCES = \
 
 libvnc_la_LIBADD = \
   $(top_builddir)/common/libcommon.la
+
+libvnc_la_LDFLAGS = -avoid-version -module

xup/Makefile.am

@@ -18,3 +18,5 @@ libxup_la_SOURCES = \
 
 libxup_la_LIBADD = \
   $(top_builddir)/common/libcommon.la
+
+libxup_la_LDFLAGS = -avoid-version -module