add git functionality to patch-bitcoin.sh.

patch-bitcoin.sh

@@ -1,5 +1,19 @@
-#!/bin/bash
+#!/bin/sh
 
 dir=$(test -n "$1" && echo "$1" || echo "${HOME}/bitcoin")
+
 cd "$dir" || exit 1
-patch -p1 < libbitcoind.patch
+
+if test -e .git; then
+  git checkout -b libbitcoind || exit 1
+fi
+
+patch -p1 < libbitcoind.patch || exit 1
+
+if test -e .git; then
+  git add --all || exit 1
+  git commit -a -m 'allow compiling of libbitcoind.so.' || exit 1
+fi
+
+echo 'Patch completed successfully.'
+exit 0