Revert "Add format-specifier warnings to SkDebugf."

This reverts commit e58831cd9578805634b986b434a20757277b3a36.

Reason for revert: looks like breaking a few build bots

Original change's description:
> Add format-specifier warnings to SkDebugf.
>
> This CL fixes up many existing format-specifier violations in Skia.
> Note that GCC has a warning for formatting nothing, so existing calls to
> `SkDebugf("")` have been removed, or replaced with `SkDebugf("%s", "")`.
> These were apparently meant to be used as a place to set a breakpoint.
>
> Some of our clients also use SkDebug with bad format specifiers, so this
> check is currently only enabled when SKIA_IMPLEMENTATION is true.
>
> Change-Id: I8177a1298a624c6936adc24e0d8f481362a356d0
> Bug: skia:12143
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/420902
> Auto-Submit: John Stiles <johnstiles@google.com>
> Commit-Queue: Brian Osman <brianosman@google.com>
> Reviewed-by: Brian Osman <brianosman@google.com>

TBR=brianosman@google.com,ethannicholas@google.com,johnstiles@google.com

Change-Id: I07848c1bf8992925c9498e916744d0840355a077
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:12143
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/421917
Reviewed-by: Tyler Denniston <tdenniston@google.com>
Commit-Queue: Tyler Denniston <tdenniston@google.com>
diff --git a/docs/examples/Pixmap_addr.cpp b/docs/examples/Pixmap_addr.cpp
index eabe576..8e2fd2a 100644
--- a/docs/examples/Pixmap_addr.cpp
+++ b/docs/examples/Pixmap_addr.cpp
@@ -9,10 +9,10 @@
     SkPixmap pixmap(SkImageInfo::Make(image->width(), image->height(), kN32_SkColorType,
             image->alphaType()), (const void*) &pixels.front(), image->width() * 4);
     image->readPixels(nullptr, pixmap, 0, 0);
-    SkDebugf("pixels address: 0x%p\n", pixmap.addr());
+    SkDebugf("pixels address: 0x%llx\n", pixmap.addr());
     SkPixmap inset;
     if (pixmap.extractSubset(&inset, {128, 128, 512, 512})) {
-        SkDebugf("inset address:  0x%p\n", inset.addr());
+         SkDebugf("inset address:  0x%llx\n", inset.addr());
     }
 }
 }  // END FIDDLE