Build fixes for Perl/Ubuntu

Ubuntu has modified their linker such that -lfoo no longer necessarily creates
a DT_NEEDED entry for libfoo.so. This breaks Perl modules, unless
--no-as-needed is included to force an entry.

Ref: https://wiki.ubuntu.com/NattyNarwhal/ToolchainTransition

Also remove Makefile.old, build for Perl in Travis.

.travis.yml

@@ -5,4 +5,7 @@ perl:
 install: 
 - sudo apt-get update -qq
 - sudo apt-get install -y openssl libcppunit-dev libreadline6 libreadline6-dev valgrind realpath libmodule-install-perl
-script: "make && make test-fast"
+script: "make && make test-fast && make perl"
+notifications:
+  irc:
+    - "irc.freenode.net#mdbm"

src/perl/Makefile.PL

@@ -42,7 +42,7 @@ EOT
 }
 
 my $ccflags = '$(COMP_CFLAGS_RELAXED)';
-my $ldflags = '-shared -L/usr/local/lib64 -Wl,-rpath,$(LIBDIR)';
+my $ldflags = ' -Wl,--no-as-needed -shared -L/usr/local/lib64 -Wl,-rpath,$(LIBDIR)';
 my $libs = "-L\$(LIBDIR) -L../lib/\$(OBJDIR) -lmdbm -lstdc++ ";
 
 #my $makefileSuffix = ($ObjDir eq '.' ? '' : '.' . $ObjDir);
@@ -83,7 +83,7 @@ WriteMakefile(
       AUTHOR            => 'Yahoo! MDBM developers') : ()),
     CCFLAGS           => $ccflags,
     #LIBS              => ":nosearch $libs",
-    LDDLFLAGS         => "$libs $ldflags",
+    LDDLFLAGS         => " $ldflags $libs ",
     DEFINE            => '',     # e.g., '-DHAVE_SOMETHING'
     INC               => '-I$(INCDIR) -I../../include',
     'XSOPT'             => '-C++',