FCFGMerge: Close files - silence warning

Happens on Windows with --enable-debug and --enable-dbgutil

C:/cygwin/libo/core/filter/source/config/tools/merge/pyAltFCFGMerge:574:
ResourceWarning: unclosed file <_io.BufferedReader
name='C:/cygwin/libo/core/filter/source/config/fragments/filters/..\\filters\\calc
aFragmentFile = codecs.open(sFragPath, "r", "utf-8")

C:/cygwin/libo/core/filter/source/config/tools/merge/pyAltFCFGMerge:293:
ResourceWarning: unclosed file <_io.BufferedWriter
name='C:/cygwin/libo/build/workdir/wntmsci14/XcuFilterFiltersTarget/fcfg_drawgraph
aMerger.merge()

Change-Id: I60981ad366e579748e3507c9f81c74b8b902867b

filter/source/config/tools/merge/pyAltFCFGMerge

@@ -550,6 +550,7 @@ class Merger:
         aPackage = codecs.open(sPackage, 'w', "utf-8")
         printOut("write temp package \"" + sPackage)
         aPackage.write(sBuffer)
+        aPackage.close()
 
     # Reads the fragment files with the file names lFragments in directory aDir,
     # formats them and returns a string that contains the merged fragments.
@@ -577,6 +578,7 @@ class Merger:
                 raise Exception("fragment \"" + sFragPath + "\" does not exists.")
             printOut("merge fragment \"" + sFragPath + "\" ...")
             data = aFragmentFile.read()
+            aFragmentFile.close()
             data = data.replace("$(share_subdir_name)", sShareSubdirName)
             sBuffer = sBuffer + data
             sBuffer = sBuffer + "\n"