Move internal vapis to a separate directory

Now it's more maintainable and the config constants are made available

src/Makefile.am

@@ -51,7 +51,7 @@ AM_VALAFLAGS += \
 	-C \
 	--use-header \
 	--gir=Matrix-$(MATRIX_GLIB_API_VERSION).gir \
-	$(top_srcdir)/src/c-api.vapi \
+	--vapidir=$(top_srcdir)/vapi \
 	$(NULL)
 
 vala-stamp: $(libmatrix_glib_0_0_la_VALA_SOURCES)

vala-globals.mk

@@ -3,6 +3,8 @@ VALA_PKG_LIST = \
 	--pkg=Json-1.0 \
 	--pkg=libsoup-2.4 \
 	--pkg=gee-0.8 \
+	--pkg=c-api \
+	--pkg=config \
 	$(NULL)
 
 VALADOC_FLAGS = \
@@ -12,6 +14,5 @@ VALADOC_FLAGS = \
 	--package-version=$(PACKAGE_VERSION) \
 	-b $(top_srcdir)/src \
 	$(VALA_PKG_LIST) \
-	--vapidir=$(top_srcdir)/src \
-	$(top_srcdir)/src/c-api.vapi \
+	--vapidir=$(top_srcdir)/vapi \
 	$(NULL)

vapi/config.vapi

@@ -0,0 +1,22 @@
+/*
+ * This file is part of matrix-glib-sdk
+ *
+ * matrix-glib-sdk is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * matrix-glib-sdk is distributed in the hope that it will be
+ * useful, but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with matrix-glib-sdk. If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+
+[CCode (cprefix = "", lower_case_cprefix = "", cheader_filename = "config.h")]
+namespace Config {
+    public const bool DEBUG;
+}