Update png, glib, sqlite

build.sh

@@ -53,20 +53,20 @@ openslidejava_name="OpenSlide Java"
 configguess_ver="47681e2a"
 zlib_ver="1.2.8"
 libzip_ver="1.1.3"
-png_ver="1.6.25"
+png_ver="1.6.26"
 jpeg_ver="1.5.1"
 tiff_ver="4.0.6"
 openjpeg_ver="2.1.2"
 iconv_ver="0.0.8"
 gettext_ver="0.19.8.1"
 ffi_ver="3.2.1"
-glib_ver="2.50.1"
+glib_ver="2.50.2"
 gdkpixbuf_ver="2.36.0"
 pixman_ver="0.34.0"
 cairo_ver="1.14.6"
 xml_ver="2.9.4"
 sqlite_year="2016"
-sqlite_ver="3.15.0"
+sqlite_ver="3.15.1"
 openslide_ver="3.4.1"
 openslidejava_ver="0.12.2"