Remove function prototypes and -Wmissing-prototypes from CFLAGS.

Declaring prototypes is just extra work for no gain if the code is
ordered righti (which is the case here).

Makefile

@@ -3,7 +3,7 @@ CFLAGS_OPT?=	-O2
 CFLAGS_WARN?=	-Wall -W -Wextra -Wshadow -Wformat-security \
 		-std=c99 -pedantic -Wbad-function-cast \
 		-Wcast-align -Wcast-qual -Wchar-subscripts -Winline \
-		-Wmissing-prototypes -Wnested-externs -Wpointer-arith \
+		-Wnested-externs -Wpointer-arith \
 		-Wredundant-decls -Wstrict-prototypes
 
 CFLAGS?=	${CFLAGS_DBG} ${CFLAGS_OPT}

fjfs.c

@@ -79,14 +79,6 @@ struct files {
 
 struct files *filelist;
 
-static struct files *files_alloc(void);
-static void files_free(struct files **pfiles);
-#ifdef DO_DUMP
-static void files_dump(struct files *files);
-#endif
-static int files_add_file(struct files *files, char *filename);
-static int files_load_filelist(struct files *files, char *filename);
-
 struct files *files_alloc(void) {
 	struct files *f = calloc(1, sizeof(struct files));
 	f->alloc_files = 64;