Quote script path and remove unnecessary semicolon

libexec/rbenv-exec

@@ -17,7 +17,7 @@ RBENV_COMMAND_PATH="$(rbenv-which "$RBENV_COMMAND")"
 RBENV_BIN_PATH="${RBENV_COMMAND_PATH%/*}"
 
 for script in $(rbenv-plugin-scripts exec); do
-  source $script;
+  source "$script";
 done
 
 shift 1

libexec/rbenv-rehash

@@ -71,5 +71,5 @@ make_shims ../versions/*/bin/*
 cd "$CUR_PATH"
 
 for script in $(rbenv-plugin-scripts rehash); do
-  source $script;
+  source "$script";
 done

libexec/rbenv-which

@@ -53,7 +53,7 @@ else
 fi
 
 for script in $(rbenv-plugin-scripts which); do
-  source $script;
+  source "$script";
 done
 
 if [ -x "$RBENV_COMMAND_PATH" ]; then