user/tcpdump: remove old patch for CVE-2018-19519

This was fixed upstream in a different way, but the patch was still
being applied with some fuzz.

https://github.com/the-tcpdump-group/tcpdump/commit/511915bef7e4de2f31b8d9f581b4a44b0cfbcf53

user/tcpdump/APKBUILD

@@ -2,7 +2,7 @@
 # Maintainer: Dan Theisen <djt@hxx.in>
 pkgname=tcpdump
 pkgver=4.9.3
-pkgrel=0
+pkgrel=1
 pkgdesc="A tool for network monitoring and data acquisition"
 url="http://www.tcpdump.org"
 arch="all"
@@ -10,9 +10,7 @@ license="BSD-3-Clause"
 depends=""
 makedepends="libpcap-dev openssl-dev perl"
 subpackages="$pkgname-doc"
-source="http://www.tcpdump.org/release/$pkgname-$pkgver.tar.gz
-	CVE-2018-19519.patch
-	"
+source="http://www.tcpdump.org/release/$pkgname-$pkgver.tar.gz"
 
 # secfixes:
 #   4.9.2-r1:
@@ -67,5 +65,4 @@ package() {
 	rm -f "$pkgdir"/usr/sbin/tcpdump.4*
 }
 
-sha512sums="3aec673f78b996a4df884b1240e5d0a26a2ca81ee7aca8a2e6d50255bb53476e008a5ced4409e278a956710d8a4d31d85bbb800c9f1aab92b0b1046b59292a22  tcpdump-4.9.3.tar.gz
-eb4232e434064ec59b07840aa394cfcc05c89e817f2d4ebeb4da1dbb1c910fe1805857356d6304ebdb16e32aa6476ce90f164aabc60501b493fd5601b380af7e  CVE-2018-19519.patch"
+sha512sums="3aec673f78b996a4df884b1240e5d0a26a2ca81ee7aca8a2e6d50255bb53476e008a5ced4409e278a956710d8a4d31d85bbb800c9f1aab92b0b1046b59292a22  tcpdump-4.9.3.tar.gz"

user/tcpdump/CVE-2018-19519.patch

---- tcpdump-4.9.2/print-hncp.c.old	2017-09-03 23:17:14.000000000 +0000
-+++ tcpdump-4.9.2/print-hncp.c	2018-12-07 19:31:24.360000000 +0000
-@@ -228,6 +228,7 @@
- 	snprintf(buf, sizeof(buf), "%s/%d", ipaddr_string(ndo, &addr), plen);
-         plenbytes += 1 + IPV4_MAPPED_HEADING_LEN;
-     } else {
-+        buf[0] = '\0';
-         plenbytes = decode_prefix6(ndo, prefix, max_length, buf, sizeof(buf));
-     }
-