configure: remove old visual studio support (<2010)

BUG=b/29583530

Change-Id: If08ce6ca352f377ac4db6b9b1909b507bba6d872
(cherry picked from commit 078dff72ca7bff079cb3c56d98c588c6ea6d2814)
(cherry picked from commit 046226376533b610ddc700f14409f195aa6abd51)
diff --git a/configure b/configure
index ced8cb2..45ec93f 100755
--- a/configure
+++ b/configure
@@ -133,9 +133,6 @@
 all_platforms="${all_platforms} x86-os2-gcc"
 all_platforms="${all_platforms} x86-solaris-gcc"
 all_platforms="${all_platforms} x86-win32-gcc"
-all_platforms="${all_platforms} x86-win32-vs7"
-all_platforms="${all_platforms} x86-win32-vs8"
-all_platforms="${all_platforms} x86-win32-vs9"
 all_platforms="${all_platforms} x86-win32-vs10"
 all_platforms="${all_platforms} x86-win32-vs11"
 all_platforms="${all_platforms} x86-win32-vs12"
@@ -153,8 +150,6 @@
 all_platforms="${all_platforms} x86_64-linux-icc"
 all_platforms="${all_platforms} x86_64-solaris-gcc"
 all_platforms="${all_platforms} x86_64-win64-gcc"
-all_platforms="${all_platforms} x86_64-win64-vs8"
-all_platforms="${all_platforms} x86_64-win64-vs9"
 all_platforms="${all_platforms} x86_64-win64-vs10"
 all_platforms="${all_platforms} x86_64-win64-vs11"
 all_platforms="${all_platforms} x86_64-win64-vs12"
@@ -672,17 +667,9 @@
         vs*) enable_feature msvs
              enable_feature solution
              vs_version=${tgt_cc##vs}
-             case $vs_version in
-             [789])
-                 VCPROJ_SFX=vcproj
-                 gen_vcproj_cmd=${source_path}/build/make/gen_msvs_proj.sh
-                 ;;
-             10|11|12|14)
-                 VCPROJ_SFX=vcxproj
-                 gen_vcproj_cmd=${source_path}/build/make/gen_msvs_vcxproj.sh
-                 enabled werror && gen_vcproj_cmd="${gen_vcproj_cmd} --enable-werror"
-                 ;;
-             esac
+             VCPROJ_SFX=vcxproj
+             gen_vcproj_cmd=${source_path}/build/make/gen_msvs_vcxproj.sh
+             enabled werror && gen_vcproj_cmd="${gen_vcproj_cmd} --enable-werror"
              all_targets="${all_targets} solution"
              INLINE="__forceinline"
         ;;