FindBoost: add support for 1.49 and 1.50

Boost 1.49 has already be released. Add this and the next to come version
number to the search list.

Modules/FindBoost.cmake

@@ -65,7 +65,8 @@
 # 1.33, 1.33.0, 1.33.1, 1.34, 1.34.0, 1.34.1, 1.35, 1.35.0, 1.35.1,
 # 1.36, 1.36.0, 1.36.1, 1.37, 1.37.0, 1.38, 1.38.0, 1.39, 1.39.0,
 # 1.40, 1.40.0, 1.41, 1.41.0, 1.42, 1.42.0, 1.43, 1.43.0, 1.44, 1.44.0,
-# 1.45, 1.45.0, 1.46, 1.46.0, 1.46.1, 1.47, 1.47.0, 1.48, 1.48.0
+# 1.45, 1.45.0, 1.46, 1.46.0, 1.46.1, 1.47, 1.47.0, 1.48, 1.48.0,
+# 1.49, 1.49.0, 1.50, 1.50.0
 #
 # NOTE: If you add a new major 1.x version in Boost_ADDITIONAL_VERSIONS you should
 # add both 1.x and 1.x.0 as shown above.  Official Boost include directories
@@ -449,7 +450,7 @@ else(Boost_FIND_VERSION_EXACT)
   # The user has not requested an exact version.  Among known
   # versions, find those that are acceptable to the user request.
   set(_Boost_KNOWN_VERSIONS ${Boost_ADDITIONAL_VERSIONS}
-    "1.48.0" "1.48" "1.47.0" "1.47" "1.46.1"
+    "1.50.0" "1.50" "1.49.0" "1.49" "1.48.0" "1.48" "1.47.0" "1.47" "1.46.1"
     "1.46.0" "1.46" "1.45.0" "1.45" "1.44.0" "1.44" "1.43.0" "1.43" "1.42.0" "1.42"
     "1.41.0" "1.41" "1.40.0" "1.40" "1.39.0" "1.39" "1.38.0" "1.38" "1.37.0" "1.37"
     "1.36.1" "1.36.0" "1.36" "1.35.1" "1.35.0" "1.35" "1.34.1" "1.34.0"