sdk: be C++ friendly

This renames the weston_surface's private member to configure_private
and externs "C" the headers of the SDK.

shared/config-parser.h

@@ -23,6 +23,10 @@
 #ifndef CONFIGPARSER_H
 #define CONFIGPARSER_H
 
+#ifdef  __cplusplus
+extern "C" {
+#endif
+
 enum config_key_type {
 	CONFIG_KEY_INTEGER,		/* typeof data = int */
 	CONFIG_KEY_UNSIGNED_INTEGER,	/* typeof data = unsigned int */
@@ -69,5 +73,9 @@ int
 parse_options(const struct weston_option *options,
 	      int count, int *argc, char *argv[]);
 
+#ifdef  __cplusplus
+}
+#endif
+
 #endif /* CONFIGPARSER_H */
 

shared/matrix.h

@@ -24,6 +24,10 @@
 #ifndef WESTON_MATRIX_H
 #define WESTON_MATRIX_H
 
+#ifdef  __cplusplus
+extern "C" {
+#endif
+
 enum weston_matrix_transform_type {
 	WESTON_MATRIX_TRANSFORM_TRANSLATE	= (1 << 0),
 	WESTON_MATRIX_TRANSFORM_SCALE		= (1 << 1),
@@ -71,4 +75,8 @@ inverse_transform(const double *LU, const unsigned *p, float *v);
 #  define MATRIX_TEST_EXPORT static
 #endif
 
+#ifdef  __cplusplus
+}
+#endif
+
 #endif /* WESTON_MATRIX_H */