Fix build problems after removal of generated files.

Restore custom INSTALL file, accidentally removed in 295f901.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

INSTALL

@@ -0,0 +1,46 @@
+HowTo Build Minix Editline
+==========================
+
+Minix editline use the GNU configure tools, which includes autoconf,
+automake and libtool.  This enables high levels of portability and ease
+of use.  In most cases all you need to do is unpack the tarball, enter
+the directory and type:
+
+    ./configure
+
+There are are, however, more options available.  For instance, sometimes
+it is useful to build editline as a static library, type:
+
+    ./configure --disable-shared
+
+By default editline employs a default handler for the TAB key, pressing
+it once completes to the nearest matching filename in the current
+working directory, or it can display a listing of possible completions.
+For some uses this default is not desirable at all, type:
+
+    ./configure --disable-default-complete
+
+An even more common desire is to change the default install location.
+By default all configure scripts setup /usr/local as the install
+"prefix", to change this type:
+
+    ./configure --prefix=/home/troglobit/tmp
+
+Advanced users are encouraged to read up on --libdir, --mandir, etc. in
+the GNU Configure and Build System.
+
+For more available options, type:
+
+    ./configure --help
+
+To build and install, simply type:
+
+    make
+
+followed by
+
+    sudo make install
+
+Good Luck!
+     //Joachim
+