Move version macros to public V8 header.

tools/common-includes.sh

Index: tools/common-includes.sh
diff --git a/tools/common-includes.sh b/tools/common-includes.sh
index 7785e9fc306625e9a5f7e7ded729f92a88b08b77..69ccc6ba531ad1d8423b1561c3899ef66e1a03cc 100644
--- a/tools/common-includes.sh
+++ b/tools/common-includes.sh
@@ -33,7 +33,7 @@
 # - PERSISTFILE_BASENAME
 
 TEMP_BRANCH=$BRANCHNAME-temporary-branch-created-by-script
-VERSION_FILE="src/version.cc"
+VERSION_FILE="include/v8.h"
 CHANGELOG_ENTRY_FILE="$PERSISTFILE_BASENAME-changelog-entry"
 PATCH_FILE="$PERSISTFILE_BASENAME-patch"
 COMMITMSG_FILE="$PERSISTFILE_BASENAME-commitmsg"
@@ -143,7 +143,7 @@ common_cleanup() {
 read_and_persist_version() {
   for v in MAJOR_VERSION MINOR_VERSION BUILD_NUMBER PATCH_LEVEL; do
     VARNAME="$1${v%%_*}"
-    VALUE=$(grep "#define $v" "$VERSION_FILE" | awk '{print $NF}')
+    VALUE=$(grep "#define V8_$v" "$VERSION_FILE" | awk '{print $NF}')
     eval "$VARNAME=\"$VALUE\""
     persist "$VARNAME"
   done