RFR: JDK-8167424 Stop adding missing newline to manifest files

[Magnus Ihse Bursie]

Due to a piece of broken internal code, a workaround was added to 
JarArchive to handle misformed manifest files. The root cause have now 
been fixed, and the workaround should be removed and the original code 
restored.

Bug: https://bugs.openjdk.java.net/browse/JDK-8158181
Patch inline:

diff --git a/make/common/JarArchive.gmk b/make/common/JarArchive.gmk
--- a/make/common/JarArchive.gmk
+++ b/make/common/JarArchive.gmk
@@ -242,7 +242,7 @@
          # potential changes.
         $$(if $$(filter $$($1_VARDEPS_FILE) $$($1_MANIFEST), $$?), \
           $$(if $$($1_MANIFEST), \
-           $(SED) -e '$(DOLLAR)$(DOLLAR)a\' $$($1_MANIFEST) > 
$$($1_MANIFEST_FILE) $$(NEWLINE) \
+           $(CP) $$($1_MANIFEST) $$($1_MANIFEST_FILE) $$(NEWLINE) \
           , \
             $(RM) $$($1_MANIFEST_FILE) && $(TOUCH) $$($1_MANIFEST_FILE) 
$$(NEWLINE)) \
           $$(if $$($1_JARMAIN), \


/Magnus