[gtk+] gsk: Mark internal symbols as static

[Emmanuele Bassi <ebassi src gnome org>]

commit c71aeff9b2c4f497083212bdbf68d5cbf613fc90
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Wed Apr 26 17:23:12 2017 +0100

    gsk: Mark internal symbols as static
    
    These symbols are not used anywhere outside of GskVulkanImage.

 gsk/gskvulkanimage.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/gsk/gskvulkanimage.c b/gsk/gskvulkanimage.c
index 4dea8e6..7fabe6f 100644
--- a/gsk/gskvulkanimage.c
+++ b/gsk/gskvulkanimage.c
@@ -259,7 +259,7 @@ gsk_vulkan_image_ensure_view (GskVulkanImage *self,
                                    &self->vk_image_view);
 }
 
-GskVulkanImage *
+static GskVulkanImage *
 gsk_vulkan_image_new_from_data_via_staging_buffer (GskVulkanUploader *uploader,
                                                    guchar            *data,
                                                    gsize              width,
@@ -364,7 +364,7 @@ gsk_vulkan_image_new_from_data_via_staging_buffer (GskVulkanUploader *uploader,
   return self;
 }
 
-GskVulkanImage *
+static GskVulkanImage *
 gsk_vulkan_image_new_from_data_via_staging_image (GskVulkanUploader *uploader,
                                                   guchar            *data,
                                                   gsize              width,
@@ -483,7 +483,7 @@ gsk_vulkan_image_new_from_data_via_staging_image (GskVulkanUploader *uploader,
   return self;
 }
 
-GskVulkanImage *
+static GskVulkanImage *
 gsk_vulkan_image_new_from_data_directly (GskVulkanUploader *uploader,
                                          guchar            *data,
                                          gsize              width,