extlib: update libpng to 1.6.42

libpng 1.6.40 -> 1.6.42 I've also changed submodule URLs again. git submodule sync is your friend.
thpatch · Jan 31, 2024 · 1a76c62 · 1a76c62
1 parent dbfc59f
commit 1a76c62
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diff --git a/.gitmodules b/.gitmodules
@@ -1,9 +1,9 @@
 [submodule "thanm/libpng"]
 	path = extlib/libpng
-	url = https://github.com/glennrp/libpng.git
+	url = https://github.com/pnggroup/libpng.git
 [submodule "thanm/zlib-ng"]
 	path = extlib/zlib-ng
 	url = https://github.com/zlib-ng/zlib-ng.git
 [submodule "thtypes"]
 	path = extlib/thtypes
-	url = https://github.com/thpatch/thtypes
+	url = https://github.com/thpatch/thtypes.git
diff --git a/extlib/libpng b/extlib/libpng