Drop subset tarball and replace it with "configure --enable-subset"

There's no point creating two separate tarfiles.  It's not clear
anyone was actually using the subset tarball --- and if they are, they
can replace it by the full source distribution and using the
--enable-subset option.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
diff --git a/configure b/configure
index a18b631..b9ce7b9 100755
--- a/configure
+++ b/configure
@@ -741,6 +741,7 @@
 RESIZER_CMT
 IMAGER_CMT
 DEBUGFS_CMT
+ALL_CMT
 BLKID_CMT
 DEPPROFILED_LIBBLKID
 PROFILED_LIBBLKID
@@ -868,6 +869,7 @@
 enable_testio_debug
 enable_libuuid
 enable_libblkid
+enable_subset
 enable_backtrace
 enable_debugfs
 enable_imager
@@ -1542,6 +1544,7 @@
   --disable-testio-debug  disable the use of the test I/O manager for debugging
   --enable-libuuid	  build and use private uuid library
   --enable-libblkid	  build and use private blkid library
+  --enable-subset  	  enable subset-only build
   --disable-backtrace	  disable use backtrace
   --disable-debugfs   	  disable support of debugfs program
   --disable-imager   	  disable support of e2image program
@@ -5640,6 +5643,22 @@
 
 
 
+ALL_CMT=
+# Check whether --enable-subset was given.
+if test "${enable_subset+set}" = set; then :
+  enableval=$enable_subset; if test "$enableval" = "no"
+then
+	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: Disabling subset-only build" >&5
+$as_echo "Disabling subset-only build" >&6; }
+else
+	ALL_CMT=#
+	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: Enabling subset-only-build" >&5
+$as_echo "Enabling subset-only-build" >&6; }
+fi
+
+fi
+
+
 
 # Check whether --enable-backtrace was given.
 if test "${enable_backtrace+set}" = set; then :