build: Fix build with parallel make

Duplicating the build stuff in both SparkleShare/Linux/Makefile.am and
SparkleShare/Makefile.am means that SparkleShare.exe will be built
twice. This is useless, and fails when using parallel make (make -j2).

The part that builds and installs SparkleShare.exe on Linux is now only
in SparkleShare/Linux/Makefile.am.

SparkleShare/Linux/Makefile.am

@@ -40,3 +40,7 @@ bin_SCRIPTS = sparkleshare
 Applicationsdir = $(datadir)/applications
 dist_Applications_DATA = sparkleshare.desktop \
 	sparkleshare-invite-opener.desktop
+
+install-data-hook:
+	test -f $(datadir)/applications/defaults.list && \
+	test -z $(DESTDIR) && update-desktop-database $(datadir)/applications || :

SparkleShare/Makefile.am

@@ -1,30 +1,2 @@
 SUBDIRS = Linux \
 	Common
-
-ASSEMBLY = SparkleShare
-TARGET = exe
-
-LINK = $(REF_SPARKLESHARE) $(NOTIFY_SHARP_LIBS) $(WEBKIT_SHARP_LIBS)
-
-if HAVE_APP_INDICATOR
-BUILD_DEFINES="-define:HAVE_APP_INDICATOR"
-endif
-
-SOURCES =  \
-	Program.cs \
-	SparkleAboutController.cs \
-	SparkleBubblesController.cs \
-	SparkleControllerBase.cs \
-	SparkleEventLogController.cs \
-	SparkleExtensions.cs \
-	SparkleInvite.cs \
-	SparkleKeys.cs \
-	SparklePlugin.cs \
-	SparkleSetupController.cs \
-	SparkleStatusIconController.cs
-
-include $(top_srcdir)/build/build.mk
-	
-install-data-hook:
-	test -f $(datadir)/applications/defaults.list && \
-	test -z $(DESTDIR) && update-desktop-database $(datadir)/applications || :