Remove harmful HAVE_SEARCH_H

This fixes building the keysym generator.
Regression from 3cea7a78.

modules/services_discovery/pulse.c

@@ -24,9 +24,7 @@
 # include <config.h>
 #endif
 
-#ifdef HAVE_SEARCH_H
 #include <search.h>
-#endif
 #include <assert.h>
 
 #include <vlc_common.h>

modules/services_discovery/udev.c

@@ -25,9 +25,7 @@
 #endif
 
 #include <errno.h>
-#ifdef HAVE_SEARCH_H
 #include <search.h>
-#endif
 #include <poll.h>
 #include <sys/stat.h>
 #include <fcntl.h>

modules/video_output/xcb/keysym.c

@@ -25,9 +25,7 @@
 #include <stdlib.h>
 #include <inttypes.h>
 #include <limits.h>
-#ifdef HAVE_SEARCH_H
 #include <search.h>
-#endif
 #include <assert.h>
 
 struct keysym