Rewrite ARCHITECTURES syntax to new HaikuPorter changes.

HaikuPorter now does not care what is in ARCHITECTURES when
building for a SECONDARY_ARCHITECTURE.

app-arch/libarchive/libarchive-3.1.2.recipe

@@ -27,14 +27,7 @@ LICENSE="BSD (2-clause)"
 COPYRIGHT="2003-2013 Tim Kientzle"
 REVISION="1"
 
-ARCHITECTURES="x86"
-if [ $effectiveTargetArchitecture != x86_gcc2 ]; then
-    # x86_gcc2 is fine as primary target architecture as long as we're building
-    # for a different secondary architecture.
-    ARCHITECTURES="$ARCHITECTURES x86_gcc2"
-else
-    ARCHITECTURES="$ARCHITECTURES !x86_gcc2"
-fi
+ARCHITECTURES="!x86_gcc2 x86"
 SECONDARY_ARCHITECTURES="x86"
 
 # On x86_gcc2 we don't want to install the commands in bin/<arch>/, but in bin/.
@@ -105,6 +98,6 @@ INSTALL()
 }
 
 TEST()
-{ 
-	make check 
+{
+	make check
 }