Replaced em_mapclean by em_commit

git-svn-id: svn://svn.cc65.org/cc65/trunk@1682 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/em/em_commit.s

@@ -0,0 +1,16 @@
+;
+; Ullrich von Bassewitz, 2002-12-01
+;
+; void __fastcall__ em_commit (void);
+; /* Commit changes in the memory window to extended storage. If the contents
+;  * of the memory window have been changed, these changes may be lost if
+;  * em_map, em_copyfrom or em_copyto are called without calling em_commit
+;  * first. Note: Not calling em_commit does not mean that the changes are
+;  * discarded, it does just mean that some drivers will discard the changes.
+;  */
+
+        .include        "em-kernel.inc"
+
+       	_em_commit      = emd_commit            ; Use driver entry
+
+