Forgot to add vfp_set_salt.c to Makefile.am.

This has entailed compiling it to an object file (rather than just
including it in vfp.c).

src/Makefile.am

@@ -12,6 +12,7 @@ libvmod_ece_la_SOURCES = \
 	rfc8188.h \
 	vfp.c \
 	vfp.h \
+	vfp_set_salt.c \
 	foreign/vend.h \
 	keys.h
 

src/vfp.c

@@ -105,11 +105,11 @@ struct ece {
 };
 
 /*
- * Include the set_salt() function if set-salt was enabled at configure
- * time
+ * Declare the set_salt() function if set-salt was enabled at configure
+ * time.
  */
 #ifdef ENABLE_SET_SALT
-#include "vfp_set_salt.c"
+enum vfp_status set_salt(struct vfp_ctx *ctx, uint8_t *salt);
 #endif
 
 static inline void

src/vfp_set_salt.c

@@ -26,7 +26,18 @@
  * SUCH DAMAGE.
  */
 
-/* Included from vfp.c only if set-salt was enabled at configure time. */
+#include "config.h"
+
+/* Used only if set-salt was enabled at configure time. */
+#ifdef ENABLE_SET_SALT
+
+#include <stdint.h>
+#include <string.h>
+
+#include "rfc8188.h"
+
+#include "cache/cache.h"
+#include "cache/cache_filter.h"
 
 /*
  * libcrypto base64 encodings use the alphabet [a-ZA-Z0-9/+] and = padding
@@ -41,7 +52,7 @@
 #define SALT_B64_LEN 24
 #define SALT_DECODED_LEN (SALT_LEN + 2)
 
-static enum vfp_status
+enum vfp_status
 set_salt(struct vfp_ctx *ctx, uint8_t *salt)
 {
 	const char *salt_b64;
@@ -62,3 +73,5 @@ set_salt(struct vfp_ctx *ctx, uint8_t *salt)
 	memcpy(salt, decoded, SALT_LEN);
 	return (VFP_OK);
 }
+
+#endif // ENABLE_SET_SALT