Remove now redundant EnsureSConsVersion() calls in SConscript files.

doc/manual/SConscript

@@ -5,7 +5,6 @@ Import("env")
 # Making the manual
 #
 if "manual" in COMMAND_LINE_TARGETS or "update-po4a" in COMMAND_LINE_TARGETS or "pot-update" in COMMAND_LINE_TARGETS:
-    EnsureSConsVersion(0, 98, 0)
     env.Command("manual.en.xml", "manual.txt",
     	"asciidoc -b docbook -d book -n -a toc -o $TARGET $SOURCE && dos2unix $TARGET")
     manuals = Glob("*.xml")

src/SConscript

@@ -389,7 +389,6 @@ if env["svnrev"] != "" and env["svnrev"] != "exported":
 
 sources = []
 if "TAGS" in COMMAND_LINE_TARGETS:
-    EnsureSConsVersion(0, 98)
     sources = [ Glob(os.path.join(dir, pattern)) for dir in ["", "*", "*/*"] for pattern in ["*.cpp", "*.hpp"] ]
 
 Export("sources")