[gobject-introspection] MSVC builds: Add files to 'make dist'

[Chun-wei Fan <fanchunwei src gnome org>]

commit 8ba49312f8d58fc9dc0aa0c1e597b1e362e6d749
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Fri Mar 18 18:21:30 2016 +0800

    MSVC builds: Add files to 'make dist'
    
    We also want to include the gi-install.vcxproj.filters for the
    Visual Studio 2012~2015 builds, to make the gi-install project
    look nicer in the IDE, which was done in the last commit.

 build/win32/vs11/Makefile.am |    1 +
 build/win32/vs12/Makefile.am |    1 +
 build/win32/vs14/Makefile.am |    1 +
 3 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/build/win32/vs11/Makefile.am b/build/win32/vs11/Makefile.am
index db1ca94..2e9d02a 100644
--- a/build/win32/vs11/Makefile.am
+++ b/build/win32/vs11/Makefile.am
@@ -20,6 +20,7 @@ EXTRA_DIST = \
        _giscanner.vcxproj      \
        _giscanner.vcxproj.filters      \
        gi-install.vcxproj      \
+       gi-install.vcxproj.filters      \
        gi-introspect.vcxproj   \
        README.txt
 
diff --git a/build/win32/vs12/Makefile.am b/build/win32/vs12/Makefile.am
index 54f036d..eaff979 100644
--- a/build/win32/vs12/Makefile.am
+++ b/build/win32/vs12/Makefile.am
@@ -20,6 +20,7 @@ EXTRA_DIST = \
        _giscanner.vcxproj      \
        _giscanner.vcxproj.filters      \
        gi-install.vcxproj      \
+       gi-install.vcxproj.filters      \
        gi-introspect.vcxproj   \
        README.txt
 
diff --git a/build/win32/vs14/Makefile.am b/build/win32/vs14/Makefile.am
index 2541de1..7ed9397 100644
--- a/build/win32/vs14/Makefile.am
+++ b/build/win32/vs14/Makefile.am
@@ -20,6 +20,7 @@ EXTRA_DIST = \
        _giscanner.vcxproj      \
        _giscanner.vcxproj.filters      \
        gi-install.vcxproj      \
+       gi-install.vcxproj.filters      \
        gi-introspect.vcxproj   \
        README.txt