envsetup.sh: cd to toplevel in get_build_var

dumpvar doesn't work right if we're not called from the toplevel;
due to the way the build system works internally, -C does not
suffice. This was already done in get_abs_build_var.

Redundant -C calls removed since we're at the toplevel already.

Change-Id: Iaaa48982547d099186922cc3ddc417a82c85e9a5
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
diff --git a/envsetup.sh b/envsetup.sh
index 33d73f1..bc4f6a1 100644
--- a/envsetup.sh
+++ b/envsetup.sh
@@ -34,7 +34,7 @@
         return
     fi
     (\cd $T; CALLED_FROM_SETUP=true BUILD_SYSTEM=build/core \
-      make --no-print-directory -C "$T" -f build/core/config.mk dumpvar-abs-$1)
+      make --no-print-directory -f build/core/config.mk dumpvar-abs-$1)
 }
 
 # Get the exact value of a build variable.
@@ -45,8 +45,8 @@
         echo "Couldn't locate the top of the tree.  Try setting TOP." >&2
         return
     fi
-    CALLED_FROM_SETUP=true BUILD_SYSTEM=build/core \
-      make --no-print-directory -C "$T" -f build/core/config.mk dumpvar-$1
+    (\cd $T; CALLED_FROM_SETUP=true BUILD_SYSTEM=build/core \
+      make --no-print-directory -f build/core/config.mk dumpvar-$1)
 }
 
 # check to see if the supplied product is one we can build