build-sys: Install code generation data/scripts

spice-common generate code from these python scripts and the installed
SPICE .proto. This commit installs them during make install, and adds a
codegendir variable to the pkgconfig file so that spice-common can
locate the scripts.

python_modules/Makefile.am

@@ -1,16 +1,15 @@
 NULL =
 
-PYTHON_MODULES =				\
-	__init__.py				\
-	codegen.py				\
-	demarshal.py				\
-	marshal.py				\
-	ptypes.py				\
-	spice_parser.py				\
+python_codegendir = $(libdir)/spice-protocol/python_modules
+dist_python_codegen_DATA =		\
+	__init__.py			\
+	codegen.py			\
+	demarshal.py			\
+	marshal.py			\
+	ptypes.py			\
+	spice_parser.py			\
 	$(NULL)
 
-EXTRA_DIST = $(PYTHON_MODULES)
-
 DISTCLEANFILES = *.pyc
 
 -include $(top_srcdir)/git.mk

spice-protocol.pc.in

@@ -1,5 +1,7 @@
 prefix=@prefix@
+exec_prefix=@exec_prefix@
 includedir=@includedir@
+codegendir=@libdir@/spice-protocol
 
 Name: spice-protocol
 Description: SPICE protocol headers