Clean path when building autoconf and automake.

Autoconf hard codes paths into itself. This change is a first
pass at allowing a clean environment to let automake build. The
ability to 'make install DESTDIR=xxx' autoconf then use it to
build automake needs a clean environment. The purpose is to
allow a prefix that needs root without building and packaging
when root.

source-builder/config/autoconf-2-1.cfg

@@ -31,10 +31,15 @@ cd autoconf-%{autoconf_version}
 cd ..
 
 %build
-  export PATH="%{_bindir}:${PATH}"
+  if test "%{_internal_autotools}" == "yes"; then
+    export PATH="%{_bindir}:${PATH}"
+  else
+    export PATH=$SB_ORIG_PATH
+  fi
+
   cd autoconf-%{autoconf_version}
 
-  if "%{_internal_autotools}" == "yes"; then
+  if test "%{_internal_autotools}" == "yes"; then
     ac_prefix=$SB_TMPPREFIX
   else
     ac_prefix=%{_prefix}

source-builder/config/automake-1-1.cfg

@@ -31,11 +31,15 @@ cd automake-%{automake_version}
 cd ..
 
 %build
-  export PATH="%{_bindir}:${PATH}"
+  if test "%{_internal_autotools}" == "yes"; then
+    export PATH="%{_bindir}:${PATH}"
+  else
+    export PATH=$SB_ORIG_PATH
+  fi
 
   cd automake-%{automake_version}
 
-  if "%{_internal_autotools}" == "yes"; then
+  if test "%{_internal_autotools}" == "yes"; then
     am_prefix=$SB_TMPPREFIX
   else
     am_prefix=%{_prefix}

source-builder/sb/setbuilder.py

@@ -133,6 +133,7 @@ class buildset:
         # exporting to the environment
         os.environ['SB_TMPPREFIX'] = tmpprefix
         os.environ['SB_TMPBINDIR'] = tmpbindir
+        os.environ['SB_ORIG_PATH'] = os.environ['PATH']
         os.environ['PATH'] = path.host(tmpbindir) + os.pathsep + os.environ['PATH']
         self._output('path: ' + os.environ['PATH'])
         # shell format