configure/Makefiles: add checks for Xmu, Xext, and Xdmcp

We also remove sun pro specific options, and do some general cleanup
as well as remove hardcoded library refs like -lXm, -lXext, etc...

cde/programs/dtcm/dtcm/Makefile.am

@@ -7,10 +7,6 @@ AM_CFLAGS = $(DT_INCDIR) $(CSA_INCDIR) -I../../../lib/csa	\
 
 LDADD = ../libDtCmP/libDtCmP.a $(LIBCSA) $(DTCLIENTLIBS) $(XTOOLLIB)
 
-if SOLARIS
-AM_CFLAGS += -xstrconst -Xc -v
-endif
-
 if FREEBSD
 LDADD += -lcompat
 endif

cde/programs/dtcm/libDtCmP/Makefile.am

@@ -5,10 +5,6 @@ noinst_LIBRARIES = libDtCmP.a
 libDtCmP_a_CFLAGS = $(CSA_INCDIR) -I../../../lib/csa -DRFC_MIME	\
 	-DLINE_COUNT -DV2 -DOW_I18N
 
-if SOLARIS
-libDtCmP_a_CFLAGS += -xstrconst -Xc -v
-endif
-
 libDtCmP_a_SOURCES = cm_tty.c cmfns.c dtfns.c props.c resource.c	\
 		     timeops.c util.c getdate.y
 

cde/programs/dtcm/server/Makefile.am

@@ -7,7 +7,6 @@ rpc_cmsd_CFLAGS = -I../../../lib/csa $(DT_INCDIR) $(CSA_INCDIR)
 rpc_cmsd_LDADD = $(LIBCSA) $(DTCLIENTLIBS) $(TIRPCLIB) $(XTOOLLIB)
 
 if SOLARIS
-rpc_cmsd_CFLAGS += -xstrconst -Xc -v
 rpc_cmsd_LDADD += -lsocket -lnsl -lintl -lm -ldl
 endif