Revert "rpm: Fix requirements installation on SUSE"

This reverts commit 02c6a2ca.

icinga-build-rpm-binary

@@ -41,16 +41,9 @@ echo "[ Installing build dependencies ]"
 case "$ICINGA_BUILD_OS" in
   opensuse*|sles)
     (
-      if ! requires="$(rpm -qpR "${source_rpm}")"; then
-        echo "Could not lookup requires in source RPM!" >&2
-        exit 1
-      fi
-
-      echo "Found required: $requires"
-      if [ -n "$requires" ]; then
-        set -ex
-        run-retry-timeout sudo zypper --non-interactive install
-      fi
+      set -ex
+      # shellcheck disable=SC2046
+      run-retry-timeout sudo zypper --non-interactive install $(rpm -qpR "${source_rpm}")
     )
     ;;
   *)