python2: Patch /bin/sh path in subprocess.py

This fixes #13.

packages/python2/Lib-subprocess.py.patch

@@ -0,0 +1,12 @@
+diff -u -r ../Python-2.7.10/Lib/subprocess.py ./Lib/subprocess.py
+--- ../Python-2.7.10/Lib/subprocess.py	2015-05-23 12:09:07.000000000 -0400
++++ ./Lib/subprocess.py	2015-09-26 18:01:13.672071916 -0400
+@@ -1206,7 +1206,7 @@
+                 args = list(args)
+ 
+             if shell:
+-                args = ["/bin/sh", "-c"] + args
++                args = ["@TERMUX_PREFIX@/bin/sh", "-c"] + args
+                 if executable:
+                     args[0] = executable
+ 

packages/python2/build.sh

@@ -7,6 +7,7 @@ TERMUX_PKG_HOSTBUILD=true
 
 _MAJOR_VERSION=2.7
 TERMUX_PKG_VERSION=${_MAJOR_VERSION}.10
+TERMUX_PKG_BUILD_REVISION=1
 TERMUX_PKG_SRCURL=http://www.python.org/ftp/python/${TERMUX_PKG_VERSION}/Python-${TERMUX_PKG_VERSION}.tar.xz
 
 # The flag --with(out)-pymalloc (disable/enable specialized mallocs) is enabled by default and causes m suffix versions of python.