Use boost-python instead of boost => with-python

Boost.Python support in Homebrew is moving from the boost formula to a
new boost-python formula. This commit updates formulas that were using
boost --with-python to use boost-python instead.

This should not be committed to master until Homebrew/legacy-homebrew#30957 is
accepted.

Closes #1080.

gal-sim.rb

@@ -8,7 +8,8 @@ class GalSim < Formula
 
   depends_on "scons" => :build
   depends_on "fftw"
-  depends_on "boost" => 'with-python'
+  depends_on "boost"
+  depends_on "boost-python"
   depends_on "tmv-cpp"
 
   # pyfits should come from pip

graph-tool.rb

@@ -17,13 +17,15 @@ class GraphTool < Formula
   depends_on 'cairomm' => 'c++11' if build.with? 'cairo'
 
   if build.with? 'python3'
-    depends_on 'boost' => ['c++11', 'with-python3']
+    depends_on 'boost' => 'c++11'
+    depends_on 'boost-python' => 'with-python3'
     depends_on 'py3cairo' if build.with? 'cairo'
     depends_on 'matplotlib' => 'with-python3'
     depends_on 'numpy' => 'with-python3'
     depends_on 'scipy' => 'with-python3'
   else
-    depends_on 'boost' => ['c++11', 'with-python']
+    depends_on 'boost' => 'c++11'
+    depends_on 'boost-python'
     depends_on 'py2cairo' if build.with? 'cairo'
     depends_on 'matplotlib'
     depends_on 'numpy'

madlib.rb

@@ -8,9 +8,9 @@ class Madlib < Formula
   head "https://github.com/madlib/madlib.git", :branch => "master"
 
   boost_opts = []
-  boost_opts << "with-python" if build.with? :python
   boost_opts << "c++11" if MacOS.version < :mavericks
   depends_on "boost" => boost_opts
+  depends_on "boost-python" if build.with? "python"
   depends_on "cmake" => :build
   depends_on "postgresql" => ['with-python']
   depends_on :python => :optional

openimageio.rb

@@ -14,7 +14,8 @@ class Openimageio < Formula
   depends_on 'opencolorio'
   depends_on 'ilmbase'
   depends_on 'openexr'
-  depends_on 'boost' => 'with-python'
+  depends_on 'boost'
+  depends_on 'boost-python'
   depends_on 'libtiff'
   depends_on 'jpeg'
   depends_on 'openjpeg'

pykep.rb

@@ -7,7 +7,8 @@ class Pykep < Formula
   head "https://github.com/esa/pykep.git"
 
   depends_on "cmake" => :build
-  depends_on "boost" => "with-python"
+  depends_on "boost"
+  depends_on "boost-python"
   depends_on :python
 
   def install

vigra.rb

@@ -22,9 +22,9 @@ class Vigra < Formula
   # vigra python bindings requires boost-python
   # see http://packages.ubuntu.com/saucy/python-vigra
   if build.with? "python"
-    boostwith = ["with-python"]
+    boostwith = []
     boostwith << "c++11" if build.cxx11?
-    depends_on "boost" => boostwith
+    depends_on "boost-python" => boostwith
   end
 
   def install