[monitoring-plugins] Add pkgconf as dependency for rpm builds

[Lorenz Kästle]

 Module: monitoring-plugins
 Branch: sthen_pkg_conf
 Commit: 7917ad9278b0e68fb2e261179bf4d3e92fe26eda
 Author: Lorenz Kästle <lorenz.kaestle at netways.de>
   Date: Fri Jan  2 14:15:16 2026 +0100
    URL: https://www.monitoring-plugins.org/repositories/monitoring-plugins/commit/?id=7917ad92

Add pkgconf as dependency for rpm builds

---

 .github/monitoring-plugins.spec | 1 +
 1 file changed, 1 insertion(+)

diff --git a/.github/monitoring-plugins.spec b/.github/monitoring-plugins.spec
index e3465227..b6c844f8 100644
--- a/.github/monitoring-plugins.spec
+++ b/.github/monitoring-plugins.spec
@@ -37,6 +37,7 @@ BuildRequires:  gettext-devel
 BuildRequires: gcc
 BuildRequires: make
 BuildRequires: automake
+BuildRequires:  pkgconf
 
 ### Check Plugin specific build requirements
 # check_by_ssh