We always have strerror, so no need to ifdef HAVE_STRERROR.

dlls/winaspi/winaspi16.c

diff --git a/dlls/winaspi/winaspi16.c b/dlls/winaspi/winaspi16.c
index d4a3393..e60460d 100644
--- a/dlls/winaspi/winaspi16.c
+++ b/dlls/winaspi/winaspi16.c
@@ -72,11 +72,7 @@
     fd = open(device_str, O_RDWR);
     if (fd == -1) {
 	int save_error = errno;
-#ifdef HAVE_STRERROR
 	ERR("Error opening device %s, error '%s'\n", device_str, strerror(save_error));
-#else
-    ERR("Error opening device %s, error %d\n", device_str, save_error);
-#endif
 	return -1;
     }
 
@@ -308,11 +304,7 @@
 		if (save_error == ENOMEM) {
 	    MESSAGE("ASPI: Linux generic scsi driver\n  You probably need to re-compile your kernel with a larger SG_BIG_BUFF value (sg.h)\n  Suggest 130560\n");
 	}
-#ifdef HAVE_STRERROR
 		WARN("error:= '%s'\n", strerror(save_error));
-#else
-		WARN("error:= %d\n", save_error);
-#endif
     }
     goto error_exit;
   }

dlls/winsock/socket.c

diff --git a/dlls/winsock/socket.c b/dlls/winsock/socket.c
index 3a72fac..4f90de0 100644
--- a/dlls/winsock/socket.c
+++ b/dlls/winsock/socket.c
@@ -3039,11 +3039,7 @@
 UINT16 wsaErrno(void)
 {
     int	loc_errno = errno; 
-#ifdef HAVE_STRERROR
     WARN("errno %d, (%s).\n", loc_errno, strerror(loc_errno));
-#else
-    WARN("errno %d\n", loc_errno);
-#endif
 
     switch(loc_errno)
     {