Adds missing ruby:2.5 and swig:3.0 build requirements

SOURCES/modulemd.src.txt

@@ -13,11 +13,13 @@ data:
 
   dependencies:
     - buildrequires:
-        platform: [ el8 ]
-        python27: [ 2.7 ]
+        platform: [el8]
+        python27: [2.7]
+        ruby: [2.5]
+        swig: [3.0]
       requires:
-        platform: [ el8 ]
-        python27: [ 2.7 ]
+        platform: [el8]
+        python27: [2.7]
   profiles:
     common:
       rpms:
@@ -41,7 +43,7 @@ data:
     rpms:
       libselinux:
         rationale: Provides libselinux python bindings
-        ref: rhel-8.1.0
+        ref: changed/i8c-stream-2.8/libselinux-2.9-2.1.module+el8.1.0+3972+45ab4324
   buildopts:
     rpms:
       macros: |