Added missing dependicies

libs/3ds_portlibs/README.md

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+3DS Portlibs
+============
+
+Here is a Makefile for building various portlibs for 3DS.
+
+Type:
+
+    $ make
+or:
+
+    $ make all
+
+to download and install all the libraries at once.
+
+You can build and install the libraries separately:
+
+    $ make zlib
+    $ make install-zlib
+    $ make <targets>
+    $ make install
+
+This will install the portlibs to `$DEVKITPRO/portlibs/armv6k`. If this is a
+privileged location, you will need to `sudo make install-zlib` and `sudo make
+install` in order for the portlibs to be installed.
+
+Currently supports the following portlibs:
+
+* freetype (requires zlib)
+* libexif
+* libjpeg-turbo
+* libpng (requires zlib)
+* sqlite
+* zlib
+
+Download links:
+
+* [freetype-2.5.5.tar.bz2] (http://download.savannah.gnu.org/releases/freetype/freetype-2.5.5.tar.bz2)
+* [libexif-0.6.21.tar.bz2] (http://sourceforge.net/projects/libexif/files/libexif/0.6.21/libexif-0.6.21.tar.bz2/download)
+* [libjpeg-turbo-1.4.0.tar.gz] (http://sourceforge.net/projects/libjpeg-turbo/files/1.4.0/libjpeg-turbo-1.4.0.tar.gz/download)
+* [libpng-1.6.17.tar.xz] (http://prdownloads.sourceforge.net/libpng/libpng-1.6.17.tar.xz?download)
+* [sqlite-autoconf-3081002.tar.gz] (http://www.sqlite.org/2015/sqlite-autoconf-3081002.tar.gz)
+* [zlib-1.2.8.tar.gz] (http://prdownloads.sourceforge.net/libpng/zlib-1.2.8.tar.gz?download)