src/tests: Fix runtest with simple.xml

Now simple.xml.in is replaced with simple.xml and modify runtest
to copy simple.xml.

BUG=https://github.com/ibus/ibus/issues/2153

src/tests/runtest

@@ -91,6 +91,19 @@ func_copy_component () {
     fi
 }
 
+func_copy_simple_xml () {
+    file=$1
+    base=`func_basename $file`
+    libexecdir=`func_dirname $file`
+    # top_srcdir != top_builddir in make dist
+    libexecdir=`echo "$libexecdir" | sed -e "s|$top_srcdir|$top_builddir|"`
+    if test -f $file; then
+        mkdir -p components
+        sed "s|\(<exec>\).*\(/ibus-engine-simple</exec>\)|\1$libexecdir\2|" \
+                < $file > components/$base
+    fi
+}
+
 trap 'func_cleanup $tstdir' 1 2 3 15
 
 tst=$1; shift
@@ -127,7 +140,7 @@ run_test_case()
             exit -1
         fi
         # func_copy_component replaces s/$top_srcdir/%top_builddir/
-        func_copy_component "../$top_srcdir/engine/simple.xml"
+        func_copy_simple_xml "../$top_srcdir/engine/simple.xml"
         func_copy_component "../$top_srcdir/conf/memconf/memconf.xml"
 
         IBUS_COMPONENT_PATH=$PWD/components