coap.h: Remove need for different coap.h files for different OS

./autogen.sh and ./configure no longer need to be run prior to running
make for Contiki, LwIP or RIOT from the appropriate examples sub-directory.

scripts/fix_version.sh now handles updating coap.h for the different
LIBCOAP_ and PACKAGE_ definitions.

scripts/github_dist.sh

@@ -15,21 +15,36 @@ err=$?
 echo $ARCHIVE
 if test $err = 0 -a "x$ARCHIVE" != "x"; then
     DIR=`pwd`/`tar taf $ARCHIVE |cut -d/ -f1|head -1`
-    tar xaf $ARCHIVE && cd $DIR && \
-        $DIR/configure $PREFIX --enable-tests  --enable-silent-rules --enable-documentation --enable-examples --disable-dtls && \
-        make EXTRA_CFLAGS=-Werror && make install EXTRA_CFLAGS=-Werror
-    err=$?
+    tar xaf $ARCHIVE && cd $DIR
+    err=$terr
+
+    # LwIP
+    make -C $DIR/examples/lwip EXTRA_CFLAGS=-Werror
+    terr=$?
     if [ $err = 0 ] ; then
-        make -C $DIR/examples/lwip EXTRA_CFLAGS=-Werror
-        err=$?
+        err=$terr
     fi
+
+    # Contiki
+    make -C $DIR/examples/contiki
+    terr=$?
     if [ $err = 0 ] ; then
-        make -C $DIR/examples/contiki
-        err=$?
+        err=$terr
     fi
+
+    # RIOT
+    make -C $DIR/examples/riot
+    terr=$?
     if [ $err = 0 ] ; then
-        make -C $DIR/examples/riot
-        err=$?
+        err=$terr
+    fi
+
+    # Standard build
+    $DIR/configure $PREFIX --enable-tests  --enable-silent-rules --enable-documentation --enable-examples --disable-dtls && \
+    make EXTRA_CFLAGS=-Werror && make install EXTRA_CFLAGS=-Werror
+    terr=$?
+    if [ $err = 0 ] ; then
+        err=$terr
     fi
 fi