Add missing header files

They are generating warnings.

build/parsePrep.c

@@ -6,6 +6,7 @@
 #include "system.h"
 
 #include <errno.h>
+#include <libgen.h>
 
 #include <rpm/header.h>
 #include <rpm/rpmlog.h>

build/rpmfc.c

@@ -1,6 +1,7 @@
 #include "system.h"
 
 #include <errno.h>
+#include <libgen.h>
 #include <sys/select.h>
 #include <sys/wait.h>
 #include <signal.h>

lib/backend/db3.c

@@ -10,6 +10,7 @@ static int _debug = 1;	/* XXX if < 0 debugging, > 0 unusual error returns */
 #include <sys/wait.h>
 #include <popt.h>
 #include <db.h>
+#include <signal.h>
 
 #include <rpm/rpmtypes.h>
 #include <rpm/rpmmacro.h>

lib/transaction.c

@@ -5,6 +5,7 @@
 #include "system.h"
 
 #include <inttypes.h>
+#include <libgen.h>
 
 #include <rpm/rpmlib.h>		/* rpmMachineScore, rpmReadPackageFile */
 #include <rpm/rpmmacro.h>	/* XXX for rpmExpand */

misc/fnmatch.c

@@ -17,7 +17,9 @@
    Boston, MA 02111-1307, USA.  */
 
 # include "system.h"
+# include <ctype.h>
 # include <stdlib.h>
+# include <string.h>
 
 /* Find the first occurrence of C in S or the final NUL byte.  */
 static inline char *