Use #elif defined instead of #elifdef as seen elsewhere throughout the patch
file. This avoids the following errors when compiling with GCC 11:
```
mibgroup/ucd-snmp/proc.c:45:2: error: invalid preprocessing directive #elifdef; did you mean #ifdef?
45 | #elifdef HAVE_PCRE_H
| ^~~~~~~
| ifdef
mibgroup/ucd-snmp/proc.c:243:2: error: invalid preprocessing directive #elifdef; did you mean #ifdef?
243 | #elifdef HAVE_PCRE_H
| ^~~~~~~
| ifdef
```
Signed-off-by: Wei-Ting Yang <williamatcg@gmail.com>
Adjust patches for current version changes
Module "disk" renamed to "disk_hw"
Internal type "unknown" changed to "u_int32_t"
Add patch with removing macro syntax checking for successful build
Signed-off-by: Ivan Pavlov <AuthorReflex@gmail.com>
Add upstream patch adding support for pcre2 and update dependency to
require libpcre2 instead of libpcre.
--with-pcre2-8 is now needed to exclude support for pcre and only
require pcre2 as net-snmp still use and try to use pcre by default.
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
