Revert "OvmfPkg/build.sh: select the GCC49 toolchain settings for gcc…

…-7.*"

This reverts commit ca56256:

TianoCore BZ#671 <https://bugzilla.tianocore.org/show_bug.cgi?id=671> has
been fixed in commit 2f7f1e7 ("BaseTools: Add the missing -pie link
option in GCC tool chain", 2017-08-23), so we can return to the GCC5
toolchain with gcc-7.*.

Cc: Jordan Justen <jordan.l.justen@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

OvmfPkg/build.sh

@@ -102,7 +102,7 @@ case `uname` in
       4.8.*)
         TARGET_TOOLS=GCC48
         ;;
-      4.9.*|6.[0-2].*|7.*)
+      4.9.*|6.[0-2].*)
         TARGET_TOOLS=GCC49
         ;;
       *)