remove patch that no longer applies

lldpd-configure-c99.patch

@@ -1,33 +0,0 @@
-Include <stdio.h> to avoid an implicit declaration of the printf
-function.  Otherwise, the check always fails with compilers that
-do not support implicit function declarations (a C feature removed
-in 1999).
-
-Submitted upstream: <https://github.com/lldpd/lldpd/pull/565>
-
-diff --git a/configure b/configure
-index 931bb75d69c1149d..d34641df4b3d8aed 100755
---- a/configure
-+++ b/configure
-@@ -18675,7 +18675,7 @@ else
- 
-     cat confdefs.h - <<_ACEOF >conftest.$ac_ext
- /* end confdefs.h.  */
--
-+#include <stdio.h>
- int
- main ()
- {
-diff --git a/m4/progname.m4 b/m4/progname.m4
-index 28ac1748f7005139..63ddda6ab9003e5d 100644
---- a/m4/progname.m4
-+++ b/m4/progname.m4
-@@ -3,7 +3,7 @@
- #
- AC_DEFUN([lldp_CHECK___PROGNAME],[
-   AC_CACHE_CHECK([whether libc defines __progname], lldp_cv_check___progname, [
--    AC_TRY_LINK([],
-+    AC_TRY_LINK([#include <stdio.h>],
- 	[ extern char *__progname; printf("%s", __progname); ],
- 	[ lldp_cv_check___progname="yes" ],
- 	[ lldp_cv_check___progname="no" ])