Ensure IFS is reset to original value every time

bin/ruby-build

@@ -13,6 +13,8 @@
 
 RUBY_BUILD_VERSION="20151024"
 
+OLDIFS="$IFS"
+
 set -E
 exec 3<&2 # preserve original stderr at fd 3
 
@@ -102,6 +104,7 @@ os_information() {
 osx_version() {
   local -a ver
   IFS=. ver=( `sw_vers -productVersion` )
+  IFS="$OLDIFS"
   echo $(( ${ver[0]}*100 + ${ver[1]} ))
 }
 
@@ -763,6 +766,7 @@ require_gcc() {
 locate_gcc() {
   local gcc gccs
   IFS=: gccs=($(gccs_in_path))
+  IFS="$OLDIFS"
 
   verify_gcc "$CC" ||
   verify_gcc "$(command -v gcc || true)" || {
@@ -778,6 +782,7 @@ gccs_in_path() {
   local gcc path paths
   local gccs=()
   IFS=: paths=($PATH)
+  IFS="$OLDIFS"
 
   shopt -s nullglob
   for path in "${paths[@]}"; do
@@ -1062,7 +1067,6 @@ unset IPV6
 
 RUBY_BUILD_INSTALL_PREFIX="$(abs_dirname "$0")/.."
 
-OLDIFS="$IFS"
 IFS=: RUBY_BUILD_DEFINITIONS=($RUBY_BUILD_DEFINITIONS ${RUBY_BUILD_ROOT:-$RUBY_BUILD_INSTALL_PREFIX}/share/ruby-build)
 IFS="$OLDIFS"