[gtk-osx] Update pyenv and ensure it's initialized in the pipenv environment

[John Ralls <jralls src gnome org>]

commit 7a3367cda97aac2f88682f94f719c92f508b8158
Author: John Ralls <jralls ceridwen us>
Date:   Thu Apr 15 12:26:17 2021 -0700

    Update pyenv and ensure it's initialized in the pipenv environment
    
    Restores automatically building the needed python3 for the virtenv.

 gtk-osx-setup.sh | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)
---
diff --git a/gtk-osx-setup.sh b/gtk-osx-setup.sh
index 2457c4aa..1e944f4f 100755
--- a/gtk-osx-setup.sh
+++ b/gtk-osx-setup.sh
@@ -80,7 +80,11 @@ if test ! -x "$PYENV_INSTALL_ROOT/libexec/pyenv"; then
   if test -d "$PYENV_INSTALL_ROOT"; then
      rm -rf "$PYENV_INSTALL_ROOT";
   fi
-    git clone $GITHUB/pyenv/pyenv.git "$PYENV_INSTALL_ROOT"
+  git clone $GITHUB/pyenv/pyenv.git "$PYENV_INSTALL_ROOT"
+else
+    pushd "$PYENV_INSTALL_ROOT"
+    git pull
+    popd
 fi
 
 if test ! -x "$DEVPREFIX/bin/pyenv" ; then
@@ -163,6 +167,7 @@ export DEV_SRC_ROOT="$DEV_SRC_ROOT"
 export PYENV_ROOT="$PYENV_ROOT"
 export PIP_CONFIG_DIR="$PIP_CONFIG_DIR"
 export LANG=C
+eval "$(pyenv init -)"
 EOF
 
 cat <<EOF > "$DEVPREFIX/bin/jhbuild"