scons: add another prefix for mingw32 on Fedora

(cherry picked from commit f1afb352daf0e74751c99254592eef863c64392a)
diff --git a/scons/crossmingw.py b/scons/crossmingw.py
index a4ae74e..03bfbd7 100644
--- a/scons/crossmingw.py
+++ b/scons/crossmingw.py
@@ -53,6 +53,7 @@
     i486-mingw32msvc-
     i586-mingw32msvc-
     i686-mingw32msvc-
+    i686-pc-mingw32-
 """)
 
 def find(env):