Add libgit2_hash.txt to libgit2 folder

It's needed when building libgit2, and it's useful to have in the
package.

Author: bording

UpdateLibgit2ToSha.ps1

@@ -1,6 +1,6 @@
 <#
 .SYNOPSIS
-    Updates the libgit2 submodule to the specified commit and updates NativeBinaries.props with the new hash value.
+    Updates the libgit2 submodule to the specified commit and updates libgit2_hash.txt and NativeBinaries.props with the new hash value.
 .PARAMETER sha
     Desired libgit2 version. This is run through `git rev-parse`, so branch names are okay too.
 #>
@@ -88,6 +88,8 @@ Push-Location $libgit2Directory
         $binaryFilename = "git2-" + $sha.Substring(0,7)
     }
 
+    sc -Encoding ASCII (Join-Path $projectDirectory "nuget.package\libgit2\libgit2_hash.txt") $sha
+
     $buildProperties = @"
 <Project>
   <PropertyGroup>

build.libgit2.ps1

@@ -22,7 +22,7 @@ $projectDirectory = Split-Path $MyInvocation.MyCommand.Path
 $libgit2Directory = Join-Path $projectDirectory "libgit2"
 $x86Directory = Join-Path $projectDirectory "nuget.package\runtimes\win7-x86\native"
 $x64Directory = Join-Path $projectDirectory "nuget.package\runtimes\win7-x64\native"
-$hashFile = Join-Path $projectDirectory "nuget.package\contentFiles\any\any\libgit2_hash.txt"
+$hashFile = Join-Path $projectDirectory "nuget.package\libgit2\libgit2_hash.txt"
 $sha = Get-Content $hashFile 
 
 if (![string]::IsNullOrEmpty($libgit2Name)) {

build.libgit2.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-LIBGIT2SHA=`cat ./nuget.package/contentFiles/any/any/libgit2_hash.txt`
+LIBGIT2SHA=`cat ./nuget.package/libgit2/libgit2_hash.txt`
 SHORTSHA=${LIBGIT2SHA:0:7}
 
 rm -rf libgit2/build

nuget.package/libgit2/libgit2_hash.txt

@@ -0,0 +1 @@
+15e119375018fba121cf58e02a9f17fe22df0df8