prep-for-macos-build: update brew install command

cirrus-ci builds started failing like this:

  Error:
    homebrew-core is a shallow clone.
  To `brew update`, first run:
    git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core fetch --unshallow

and I noticed that the install url at https://brew.sh/ differed so try
using that one.

Signed-off-by: Rob Browning <rlb@defaultvalue.org>

diff --git a/dev/prep-for-macos-build b/dev/prep-for-macos-build
index 52efc79e146608ea6c2ba91626a336f4baa86584..e8363d3ebcb30496b06c59f7935ec241bded3900 100755 (executable)
--- a/dev/prep-for-macos-build
+++ b/dev/prep-for-macos-build
@@ -9,7 +9,7 @@ usage()
 
 pyver="${1:-python2}"
 
-/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"
+/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
 
 brew update
 brew install par2 readline rsync pkg-config md5sha1sum