ola: fix compilation of this package

This package does not currently compile.

This is needed to do so that it compiles:
- fix emptying CXX variable in configure script
- fix automake not generating Makefile (remove doxygen definitions)
- force gnu++11 by patch, does not work with configure variable
Also because of changed API in libmicrohttpd:
- fix HttpServer

Moreover this package does not support --disable-slp configure option
anymore, remove it.

Signed-off-by: Marek Behún <kabel@blackhole.sk>

net/ola/patches/201-automake-fix.patch

@@ -0,0 +1,11 @@
+--- a/Makefile.am
++++ b/Makefile.am
+@@ -12,8 +12,6 @@ AUX_DIST                = $(auxdir)/inst
+ ACLOCAL         = aclocal -I $(auxdir)
+ ACLOCAL_AMFLAGS = -I config
+ 
+-include aminclude.am
+-
+ # When running distcheck we want to enable the Python modules.
+ AM_DISTCHECK_CONFIGURE_FLAGS = --enable-python-libs
+