hg: build-infra/jdk7: Define _LP64=1 instead of just _LP64 to be compatible with old

[fredrik.ohrstrom at oracle.com]

Changeset: 17005863e635
Author:    ohrstrom
Date:      2011-11-30 12:58 +0100
URL:       http://hg.openjdk.java.net/build-infra/jdk7/rev/17005863e635

Define _LP64=1 instead of just _LP64 to be compatible with old
makefiles. Test if native language is C or C++, if not then fail.

! common/make/NativeCompilation.gmk
! configure
! configure.ac