freeradius2: completely disable runtime OpenSSL version checks

Whenever we ship fixed libopenssl binaries in BB, the Freeradius daemon fails
at startup because it detects a mismatch of the build time and runtime OpenSSL
version.

Since our OpenSSL updates for BB are ABI compatible we do not need or even want
this superflous check. Removing it saves us the effort to rebuild Freeradius
after every OpenSSL version bump.

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

net/freeradius2/patches/010-disable-openssl-check.patch

@@ -0,0 +1,56 @@
+--- a/configure.in
++++ b/configure.in
+@@ -832,35 +832,6 @@ if test "x$WITH_OPENSSL" = xyes; then
+     OPENSSL_INCLUDE="-DOPENSSL_NO_KRB5"
+   fi
+ 
+-  dnl #
+-  dnl #  Now check that the header versions match the library
+-  dnl #
+-  AC_MSG_CHECKING([OpenSSL library and header version consistency])
+-  AC_RUN_IFELSE(
+-    [AC_LANG_PROGRAM(
+-      [[
+-        #include <stdio.h>
+-        #include <openssl/opensslv.h>
+-        #include <openssl/crypto.h>
+-      ]],
+-      [[
+-        if (SSLeay() == OPENSSL_VERSION_NUMBER) {
+-          return 0;
+-        } else {
+-          printf("library: %lx header: %lx... ", (unsigned long) SSLeay(), (unsigned long) OPENSSL_VERSION_NUMBER);
+-          return 1;
+-        }
+-      ]]
+-    )],
+-    [
+-      AC_MSG_RESULT(yes)
+-    ],
+-    [
+-      AC_MSG_RESULT(no)
+-      AC_MSG_FAILURE([OpenSSL library version does not match header version])
+-    ]
+-  )
+-
+   if test "x$OPENSSL_LIBS" = x; then
+     LIBS=$old_LIBS
+     LDFLAGS="$old_LDFLAGS"
+--- a/src/main/version.c
++++ b/src/main/version.c
+@@ -43,6 +43,7 @@ static long ssl_built = OPENSSL_VERSION_
+  */
+ int ssl_check_version(int allow_vulnerable)
+ {
++#if 0
+ 	long ssl_linked;
+ 
+ 	/*
+@@ -74,6 +75,7 @@ int ssl_check_version(int allow_vulnerab
+ 			return -1;
+ 		}
+ 	}
++#endif
+ 
+ 	return 0;
+ }