Update Autotools setup

- Move root autogen.sh to the one used by Bitcoin Core (very simple, unlike the current autogen.sh).
- Remove extra uses of C++11 flags.
- Silence make output unless "V=1" is used when using make.
- Rearrange some lines so that everything's a bit more cohesive, including moving #include files to CPPFLAGS (can be accessed in C and C++, and preprocessor means the effective output doesn't change).
- Further enforce C++11 compilation.
- m4 --> build-aux/m4
- Upgrade the C++11 M4 file to fix an Autotools warning, and include new files as needed to keep autoreconf happy.
- Set the minimum Automake version to 1.11 due to silent rule macro requirements. (1.11 came out in 2009, and I doubt Armory supports any pre-1.11 systems.)
- Add a patch to ax_gcc_x86_cpu_supports.m4 to silence an Autoconf warning ("serial 3" version with one change: AC_RUN_IFELSE --> AC_COMPILE_IFELSE).
- Update macOS build script to give users the ability to get verbose make output.

Makefile.am

@@ -1,13 +1,15 @@
-# Makefile for BitcoinArmory bitcoin wallet
+# Makefile for Bitcoin Armory - Root Makefile
 SUBDIRS = cppForSwig
+bin_PROGRAMS =
+noinst_PROGRAMS =
 
 EXTRA_DIST = *.py *.md LICENSE LICENSE-ATI LICENSE-MIT \
 	nginx_example.conf imgList.xml autogen.sh \
 	armoryengine/*.py ui/*.py \
 	img/* lang/* dpkgfiles/* \
 	windowsbuild/* linuxbuild/* osxbuild/*
 
-ACLOCAL_AMFLAGS = -I m4
+ACLOCAL_AMFLAGS = -I build-aux/m4
 
 lrelease:
 if HAVE_GUI