build: Use mcs instead of gmcs as gmcs not available in latest Mono

Submitted https://github.com/mono/dbus-sharp-glib/pull/3

Signed-off-by: Alex J Lennon <ajlennon@dynamicdevices.co.uk>

diff --git dbus-sharp-glib-0.6.org/configure.ac dbus-sharp-glib-0.6/configure.ac
index 81c1839..912fae6 100644
--- dbus-sharp-glib-0.6.org/configure.ac
+++ dbus-sharp-glib-0.6/configure.ac
@@ -23,11 +23,11 @@ AC_SUBST(PKG_CONFIG)
 MONO_REQ_VERSION=1.1.13
 PKG_CHECK_MODULES(MONO, mono >= $MONO_REQ_VERSION)
 
-AC_PATH_PROG(GMCS, gmcs, no)
-if test "x$GMCS" = "xno"; then
-	AC_MSG_ERROR([You need to install gmcs])
+AC_PATH_PROG(MCS, mcs, no)
+if test "x$MCS" = "xno"; then
+	AC_MSG_ERROR([You need to install mcs])
 fi
-AC_SUBST(GMCS)
+AC_SUBST(MCS)
 
 AC_PATH_PROG(GACUTIL, gacutil, no)
 if test "x$GACUTIL" = "xno"; then
diff --git dbus-sharp-glib-0.6.org/src/Makefile.am dbus-sharp-glib-0.6/src/Makefile.am
index 2f1f7bd..b656006 100644
--- dbus-sharp-glib-0.6.org/src/Makefile.am
+++ dbus-sharp-glib-0.6/src/Makefile.am
@@ -14,7 +14,7 @@ CSFILES = \
 all: $(TARGET)
 
 $(TARGET): $(CSFILES) AssemblyInfo.cs
-	$(GMCS) -out:$@ $(CSFLAGS) $(LIBFLAGS) $^
+	$(MCS) -out:$@ $(CSFLAGS) $(LIBFLAGS) $^
 
 install-data-local:
 	@if test -n '$(TARGET)'; then                       \