Fix InstallTools race (mostly)

Obey$Dir can change during a Obey file run in a Taskwindow,
in particular writing to the output stream can trigger the
loading of a Taskwindow server such as !Edit.

InstallTools,fd7

@@ -12,6 +12,8 @@
 | See the License for the specific language governing permissions and
 | limitations under the License.
 |
+Set Build$LibDir <Obey$Dir>
+
 Echo This script will take the main build tools from a current copy of the Acorn
 Echo C/C++ tools suite (as installed from CD) and install the main tools into the
 Echo Shared Source RISC OS build directory so that you can build Shared Source RISC
@@ -19,7 +21,7 @@ Echo OS components.
 
 Echo
 Echo Checking environment...
-IfThere <Obey$Dir>.Acorn Then Else Error This script must be run from within the Shared Source RISC OS 'Library' directory.
+IfThere <Build$LibDir>.Acorn Then Else Error This script must be run from within the Shared Source RISC OS 'Library' directory.
 
 Echo
 Echo Checking that the AcornC/C++ directory has been 'seen' by the filer...
@@ -27,56 +29,56 @@ If "<SetPaths32$Dir>" = "" Then Error Please make sure you have run the AcornC/C
 
 Echo
 Echo Installing Acorn Make Utility...
-Copy <SetPaths32$Dir>.Lib32.amu <Obey$Dir>.Acorn.amu A~C~D~FLN~P~Q~R~S~T~V
+Copy <SetPaths32$Dir>.Lib32.amu <Build$LibDir>.Acorn.amu A~C~D~FLN~P~Q~R~S~T~V
 
 Echo
 Echo Installing C++...
-Copy <SetPaths32$Dir>.Lib32.c++ <Obey$Dir>.Acorn.c++ A~C~D~FLN~P~Q~R~S~T~V
+Copy <SetPaths32$Dir>.Lib32.c++ <Build$LibDir>.Acorn.c++ A~C~D~FLN~P~Q~R~S~T~V
 
 Echo
 Echo Installing the C Compiler...
-Copy <SetPaths32$Dir>.Lib32.cc <Obey$Dir>.Acorn.cc A~C~D~FLN~P~Q~R~S~T~V
+Copy <SetPaths32$Dir>.Lib32.cc <Build$LibDir>.Acorn.cc A~C~D~FLN~P~Q~R~S~T~V
 
 Echo
 Echo Installing C Front...
-Copy <SetPaths32$Dir>.Lib32.cfront <Obey$Dir>.Acorn.cfront A~C~D~FLN~P~Q~R~S~T~V
+Copy <SetPaths32$Dir>.Lib32.cfront <Build$LibDir>.Acorn.cfront A~C~D~FLN~P~Q~R~S~T~V
 
 Echo
 Echo Installing the C Module Header Generator...
-Copy <SetPaths32$Dir>.Lib32.cmhg <Obey$Dir>.Acorn.cmhg A~C~D~FLN~P~Q~R~S~T~V
+Copy <SetPaths32$Dir>.Lib32.cmhg <Build$LibDir>.Acorn.cmhg A~C~D~FLN~P~Q~R~S~T~V
 
 Echo
 Echo Installing the Acorn Object File Decoder...
-Copy <SetPaths32$Dir>.Lib32.decaof <Obey$Dir>.Acorn.decaof A~C~D~FLN~P~Q~R~S~T~V
+Copy <SetPaths32$Dir>.Lib32.decaof <Build$LibDir>.Acorn.decaof A~C~D~FLN~P~Q~R~S~T~V
 
 Echo
 Echo Installing the Library File Processor...
-Copy <SetPaths32$Dir>.Lib32.libfile <Obey$Dir>.Acorn.libfile A~C~D~FLN~P~Q~R~S~T~V
+Copy <SetPaths32$Dir>.Lib32.libfile <Build$LibDir>.Acorn.libfile A~C~D~FLN~P~Q~R~S~T~V
 
 Echo
 Echo Installing the Linker...
-Copy <SetPaths32$Dir>.Lib32.link <Obey$Dir>.Acorn.link A~C~D~FLN~P~Q~R~S~T~V
+Copy <SetPaths32$Dir>.Lib32.link <Build$LibDir>.Acorn.link A~C~D~FLN~P~Q~R~S~T~V
 
 Echo
 Echo Installing the Object Assembler...
-Copy <SetPaths32$Dir>.Lib32.objasm <Obey$Dir>.Acorn.objasm A~C~D~FLN~P~Q~R~S~T~V
+Copy <SetPaths32$Dir>.Lib32.objasm <Build$LibDir>.Acorn.objasm A~C~D~FLN~P~Q~R~S~T~V
 
 Echo
 Echo Installing the Object File Statistics Tool...
-Copy <SetPaths32$Dir>.Lib32.objsize <Obey$Dir>.Acorn.objsize A~C~D~FLN~P~Q~R~S~T~V
+Copy <SetPaths32$Dir>.Lib32.objsize <Build$LibDir>.Acorn.objsize A~C~D~FLN~P~Q~R~S~T~V
 
 Echo
 Echo Installing the Resource Area Generator...
-Copy <SetPaths32$Dir>.Lib32.ResGen <Obey$Dir>.Acorn.ResGen A~C~D~FLN~P~Q~R~S~T~V
+Copy <SetPaths32$Dir>.Lib32.ResGen <Build$LibDir>.Acorn.ResGen A~C~D~FLN~P~Q~R~S~T~V
 
 Echo
 Echo Installing the pre-built C++ libraries...
-CDir <Obey$Dir>.^.Export
-CDir <Obey$Dir>.^.Export.APCS-32
-CDir <Obey$Dir>.^.Export.APCS-32.Lib
+CDir <Build$LibDir>.^.Export
+CDir <Build$LibDir>.^.Export.APCS-32
+CDir <Build$LibDir>.^.Export.APCS-32.Lib
 Set C++Lib$Dir <SetPaths32$Dir>.^.Libraries.c++lib
 IfThere <C++Lib$Dir> Then Else Set C++Lib$Dir <SetPaths32$Dir>.^.Export.APCS-32.Lib.c++lib
-Copy <C++Lib$Dir> <Obey$Dir>.^.Export.APCS-32.Lib.c++lib A~C~D~FLN~P~QR~S~T~V
+Copy <C++Lib$Dir> <Build$LibDir>.^.Export.APCS-32.Lib.c++lib A~C~D~FLN~P~QR~S~T~V
 Unset C++Lib$Dir
 
 Echo