libgo: fix typo in configure.ac (PCQUANTUm -> PCQUANTUM)

    
    Reviewed-on: https://go-review.googlesource.com/29154

From-SVN: r240146

gcc/go/gofrontend/MERGE

-841bea960b1f097e2cff5ad2618800296dcd4ec2
+b34c93bf00ec4f2ad043ec89ff96989e0d1b26aa
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.

libgo/configure

@@ -13640,7 +13640,7 @@ case ${host} in
     GOARCH_FAMILY=ARM64
     GOARCH_CACHELINESIZE=32
     GOARCH_PHYSPAGESIZE=65536
-    GOARCH_PCQUANTUm=4
+    GOARCH_PCQUANTUM=4
     GOARCH_MINFRAMESIZE=8
     ;;
   arm*-*-* | strongarm*-*-* | ep9312*-*-* | xscale-*-*)

libgo/configure.ac

@@ -222,7 +222,7 @@ case ${host} in
     GOARCH_FAMILY=ARM64
     GOARCH_CACHELINESIZE=32
     GOARCH_PHYSPAGESIZE=65536
-    GOARCH_PCQUANTUm=4
+    GOARCH_PCQUANTUM=4
     GOARCH_MINFRAMESIZE=8
     ;;
   arm*-*-* | strongarm*-*-* | ep9312*-*-* | xscale-*-*)