configure: prepare for hybrid support

The goal is to do hybrid builds in a single jam (instead of calling a
sub-jam to build parts with the secondary tool chain). This changeset
adds support to configure to prepare multiple tool chains.

configure:
* Merge option --build-cross-tools-gcc4 into --build-cross-tools. The
  option does now always require a packaging architecture parameter,
  i.e. x86_gcc2 for the legacy tool chain.
* Multiple occurrences of the --build-cross-tools and
  --cross-tools-prefix options are allowed. The first one specifies the
  primary tool chain, the subsequent ones the secondary tool chains.
* All architecture dependent jam variables are now suffixed with the
  name of the packaging architecture. The new HAIKU_PACKAGING_ARCHS
  contains the packaging architectures for the prepared tool chains. The
  first element is for the primary tool chain.
* No longer generate a separate libgccObjects file. Just put the
  respective variable into BuildConfig as well.

build_cross_tools[_gcc4]:
* Replace the <haiku output dir> parameter by a <install dir>
  parameter. This allows to create different cross-tools directories.
  They are simply suffixed by the packaging architecture.

Jamrules:
* For the moment map the variables for the primary tool chain to the
  respective suffix-less variables, so that everything still works as
  before.

The next step is to actually support the secondary tool chains in the
jam build system. This will require quite a bit more butchering, though.

build/scripts/build_cross_tools

@@ -1,19 +1,19 @@
 #!/bin/sh
 
-# Parameters <haiku sourcedir> <buildtools dir> <haiku output dir>
+# Parameters <haiku sourcedir> <buildtools dir> <install dir>
 # Influential environmental variable:
 # * haikuRequiredLegacyGCCVersion: The required version of the gcc. Will be
 #   checked against the version in the buildtools directory.
 
 # get and check the parameters
 if [ $# -lt 3 ]; then
-	echo Usage: $0 '<haiku sourcedir> <buildtools dir> <haiku output dir>' >&2
+	echo Usage: $0 '<haiku sourcedir> <buildtools dir> <install dir>' >&2
 	exit 1
 fi
 
 haikuSourceDir=$1
 buildToolsDir=$2/legacy
-haikuOutputDir=$3
+installDir=$3
 shift 3
 additionalMakeArgs=$*
 	# Note: The gcc 2 build has trouble with -jN N > 1, hence we only use the
@@ -62,7 +62,7 @@ fi
 
 
 # create the output dir
-mkdir -p $haikuOutputDir || exit 1
+mkdir -p $installDir || exit 1
 
 
 # get absolute paths
@@ -76,13 +76,13 @@ cd $buildToolsDir
 buildToolsDir=`pwd`
 cd $currentDir
 
-cd $haikuOutputDir
-haikuOutputDir=`pwd`
+cd $installDir
+installDir=`pwd`
+cd $currentDir
 
 
 # create the object and installation directories for the cross compilation tools
-installDir=$haikuOutputDir/cross-tools
-objDir=$haikuOutputDir/cross-tools-build
+objDir=${installDir}-build
 binutilsObjDir=$objDir/binutils
 gccObjDir=$objDir/gcc
 tmpIncludeDir=$objDir/sysincludes

build/scripts/build_cross_tools_gcc4

@@ -1,18 +1,18 @@
 #!/bin/sh
 #
-# parameters <machine> <haiku sourcedir> <buildtools dir> <haiku output dir>
+# parameters <machine> <haiku sourcedir> <buildtools dir> <isntall dir>
 
 # get and check the parameters
 if [ $# -lt 4 ]; then
 	echo Usage: $0 '<machine> <haiku sourcedir> <buildtools dir>' \
-		'<haiku output dir>' >&2
+		'<install dir>' >&2
 	exit 1
 fi
 
 haikuMachine=$1
 haikuSourceDir=$2
 buildToolsDir=$3
-haikuOutputDir=$4
+installDir=$4
 shift 4
 additionalMakeArgs=$*
 
@@ -68,7 +68,7 @@ fi
 
 
 # create the output dir
-mkdir -p $haikuOutputDir || exit 1
+mkdir -p $installDir || exit 1
 
 
 # get absolute paths
@@ -82,8 +82,9 @@ cd $buildToolsDir
 buildToolsDir=$(pwd)
 cd $currentDir
 
-cd $haikuOutputDir
-haikuOutputDir=$(pwd)
+cd $installDir
+installDir=$(pwd)
+cd $currentDir
 
 binutilsSourceDir=$buildToolsDir/binutils
 gccSourceDir=$buildToolsDir/gcc
@@ -104,8 +105,7 @@ fi
 find $binutilsSourceDir $gccSourceDir -name \*.info -print0 | xargs -0 touch
 
 # create the object and installation directories for the cross compilation tools
-installDir=$haikuOutputDir/cross-tools
-objDir=$haikuOutputDir/cross-tools-build
+objDir=${installDir}-build
 binutilsObjDir=$objDir/binutils
 gccObjDir=$objDir/gcc
 stdcxxObjDir=$objDir/stdcxx