[gimp/wip/Jehan/meson-windows-official] build: use a PNG for installer. DON'T PUSH!

[Jehan <jehanp src gnome org>]

commit 16f5942c7e56821b6f693a20a62ffbbf3c672047
Author: Jehan <jehan girinstud io>
Date:   Thu Mar 31 19:43:52 2022 +0200

    build: use a PNG for installer. DON'T PUSH!
    
    Pretty sure it won't work from what I read, but… let's try!

 build/windows/installer/gimp3264.iss | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/build/windows/installer/gimp3264.iss b/build/windows/installer/gimp3264.iss
index 9af2891b85..21a5f8f733 100755
--- a/build/windows/installer/gimp3264.iss
+++ b/build/windows/installer/gimp3264.iss
@@ -276,7 +276,7 @@ Source: "windows-installer-intro-small.bmp"; Flags: dontcopy
 Source: "installsplash.bmp"; Flags: dontcopy
 Source: "installsplash_small.bmp"; Flags: dontcopy
 #else
-Source: "installsplash-devel.bmp"; Destname: "installsplash.bmp"; Flags: dontcopy
+Source: "..\..\..\data\images\gimp-splash.png"; Destname: "installsplash.png"; Flags: dontcopy
 Source: "installsplash_small-devel.bmp"; Destname: "installsplash_small.bmp"; Flags: dontcopy
 #endif
 
@@ -1319,7 +1319,7 @@ begin
        else
        begin
                try
-                       NewBitmap1 := 
TFileStream.Create(ExpandConstant('{tmp}\installsplash.bmp'),fmOpenRead);
+                       NewBitmap1 := 
TFileStream.Create(ExpandConstant('{tmp}\installsplash.png'),fmOpenRead);
                        WizardForm.WizardBitmapImage.Bitmap.LoadFromStream(NewBitmap1);
                        WelcomeBitmapBottom.Bitmap := WizardForm.WizardBitmapImage.Bitmap;
                except
@@ -1739,7 +1739,7 @@ begin
                ExtractTemporaryFile('setup.ini');
                SetupINI := ExpandConstant('{tmp}\setup.ini');
                ExtractTemporaryFile('windows-installer-intro-small.bmp');
-               ExtractTemporaryFile('installsplash.bmp');
+               ExtractTemporaryFile('installsplash.png');
                ExtractTemporaryFile('installsplash_small.bmp');
        except
                DebugMsg('InitializeSetup','Error extracting temporary file: ' + GetExceptionMessage);