PEMA-107 Add PerArchMakefile.conf

This file is meant to hold common variables for *only* architectures' Makefiles.

Organize Makefile.conf.

android/external/MakefileTemplate

@@ -3,6 +3,8 @@
 # This file may be used under the terms of the GNU General Public License version 3
 # see LICENSE.txt
 
+include ../Makefile.conf
+
 # Build parameters
 APP_ABI ?= [ARCH]
 HOST ?= [HOST]
@@ -11,7 +13,8 @@ SEQUOIA_ARCH ?= [SEQUOIA_ARCH]
 OPENSSL_ARCHITECTURE ?= [OPENSSL_ARCHITECTURE]
 COMPILER_PREFIX ?= [COMPILER_PREFIX]
 
-include ../Makefile.conf
+# This include is dependent on the *build parameters* defined above and needs to be declared after them
+include ../PerArchMakefile.conf
 
 #------------------------------------------------------------------------------#
 # Makefile to build deps for use with pEpEngine

android/external/PerArchMakefile.conf

@@ -0,0 +1,9 @@
+# This file holds variables that *should only be accessed from the Makefiles in each architecture*, which are generated from MakefileTemplate.
+
+# install root for built files
+EXTERNAL_ROOT = $(shell pwd)
+DESTDIR = $(EXTERNAL_ROOT)/..
+prefix = /output/$(APP_ABI)
+LOCAL = $(DESTDIR)$(prefix)
+NDK_TOOLCHAIN = $(NDK_TOOLCHAIN_TARGET)-$(NDK_TOOLCHAIN_COMPILER)
+TEMP_WORK_PATH = "$(ANDROID_NDK_HOME)/bin:${PATH}:$(NDK_TOOLCHAIN)/bin:$(LOCAL)/bin"