Build: fixup AM_CPPFLAGS & del comments

configure.ac

@@ -3,14 +3,9 @@ AC_INIT([The Harriman-Peikoff Project], [0.00.000],
     [harikoff],
     [github.com/latentprion/harikoff])
 
-# Safety checks in case user overwritten --srcdir
 AC_CONFIG_SRCDIR([corelogic/mind.cpp])
-
-# Store the auxiliary build tools (e.g., install-sh, config.sub, config.guess)
-# in this dir (build-aux)
 AC_CONFIG_AUX_DIR([autotools-aux])
 
-# Init automake, and specify this program does not follow the gnu coding standards.
 AM_INIT_AUTOMAKE([foreign -Wall -Werror])
 
 AC_PROG_CC
@@ -18,7 +13,8 @@ AC_PROG_CXX
 AC_PROG_RANLIB
 AM_PROG_AR
 
-AM_CPPFLAGS="-I\"\$(abs_top_srcdir)/include\" -I\"\$(abs_top_srcdir)/corelogic/include\""
+AM_CPPFLAGS=m4_normalize(["-I\"\$(abs_top_srcdir)/include\" \
+    -I\"\$(abs_top_srcdir)/corelogic/include\""])
 
 AC_SUBST(AM_CPPFLAGS)