apache: security bump to 2.4.51

Fixes (see [1] for details):

  CVE-2021-33193
  CVE-2021-41524
  CVE-2021-41773
  CVE-2021-42013

[1] https://httpd.apache.org/security/vulnerabilities_24.html

Patch 020-openssl-deprecated.patch refreshed.

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>

net/apache/Makefile

@@ -8,13 +8,13 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=apache
-PKG_VERSION:=2.4.48
+PKG_VERSION:=2.4.51
 PKG_RELEASE:=1
 PKG_SOURCE_NAME:=httpd
 
 PKG_SOURCE:=$(PKG_SOURCE_NAME)-$(PKG_VERSION).tar.bz2
 PKG_SOURCE_URL:=@APACHE/httpd/
-PKG_HASH:=1bc826e7b2e88108c7e4bf43c026636f77a41d849cfb667aa7b5c0b86dbf966c
+PKG_HASH:=20e01d81fecf077690a4439e3969a9b22a09a8d43c525356e863407741b838f4
 
 PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_SOURCE_NAME)-$(PKG_VERSION)
 

net/apache/patches/020-openssl-deprecated.patch

@@ -1,6 +1,6 @@
 --- a/modules/md/md_crypt.c
 +++ b/modules/md/md_crypt.c
-@@ -1098,23 +1098,23 @@ const char *md_cert_get_serial_number(co
+@@ -1095,23 +1095,23 @@ const char *md_cert_get_serial_number(co
  
  int md_cert_is_valid_now(const md_cert_t *cert)
  {
@@ -42,7 +42,7 @@
                       "a newer library (%s, version currently loaded is %s)"
 --- a/modules/ssl/ssl_engine_io.c
 +++ b/modules/ssl/ssl_engine_io.c
-@@ -1264,9 +1264,9 @@ static apr_status_t ssl_io_filter_handsh
+@@ -1280,9 +1280,9 @@ static apr_status_t ssl_io_filter_handsh
          if (dc->proxy->ssl_check_peer_expire != FALSE) {
              if (!cert
                  || (X509_cmp_current_time(