scripts: Update toolchain revision check script

No longer need to check spirv-tools or spirv-headers as they are now
part of glslang.

Change-Id: Ib3594d064d33a94d6443426e02a617c96b243893
diff --git a/scripts/check_toolchain_revisions.sh b/scripts/check_toolchain_revisions.sh
index 6ee3588..1083529 100755
--- a/scripts/check_toolchain_revisions.sh
+++ b/scripts/check_toolchain_revisions.sh
@@ -2,7 +2,7 @@
 
 set -e
 
-# If any tracked revision no longer matches the local revision, blast the extenal toolchain directoies
+# If any tracked revision no longer matches the local revision, blast the extenal toolchain directories
 
 function check_revision()
 {
@@ -34,16 +34,6 @@
 rev=external_revisions/glslang_revision
 check_revision $tool $dir $rev
 
-tool=spirv-tools
-dir=external/spirv-tools
-rev=external_revisions/spirv-tools_revision
-check_revision $tool $dir $rev
-
-tool=spirv-headers
-dir=external/spirv-tools/external/spirv-headers
-rev=external_revisions/spirv-headers_revision
-check_revision $tool $dir $rev
-
 tool=glslang_android
 dir=build-android/external/glslang
 rev=build-android/glslang_revision_android