[LicenseOnly] depend on libpng only once

Author: ViliusSutkus89

licenseOnly/pdf2htmlEX-dependency-tree/build.gradle

@@ -44,15 +44,15 @@ dependencies {
     implementation 'com.viliussutkus89.licenseOnly:pixman:0.40.0'
 
     // Dependencies of FreeType
-    implementation 'com.viliussutkus89.licenseOnly:libpng:1.6.37'
+//    implementation 'com.viliussutkus89.licenseOnly:libpng:'
 
     // Dependencies of FontForge
     implementation 'com.viliussutkus89.licenseOnly:cairo:1.17.4'
 //    implementation 'com.viliussutkus89.licenseOnly:FreeType:'
 //    implementation 'com.viliussutkus89.licenseOnly:GLib:'
     implementation 'com.viliussutkus89.licenseOnly:libiconv:1.16'
     implementation 'com.viliussutkus89.licenseOnly:libjpeg-turbo:2.1.3'
-    implementation 'com.viliussutkus89.licenseOnly:libpng:1.6.37'
+//    implementation 'com.viliussutkus89.licenseOnly:libpng:'
     implementation 'com.viliussutkus89.licenseOnly:libtool:2.4.6'
     implementation 'com.viliussutkus89.licenseOnly:libuninameslist:20190701'
 //    implementation 'com.viliussutkus89.licenseOnly:libxml:'
@@ -66,7 +66,7 @@ dependencies {
 //    implementation 'com.viliussutkus89.licenseOnly:GLib:'
     implementation 'com.viliussutkus89.licenseOnly:LCMS:2.13.1'
 //    implementation 'com.viliussutkus89.licenseOnly:libjpeg-turbo:'
-    implementation 'com.viliussutkus89.licenseOnly:libpng:1.6.37'
+//    implementation 'com.viliussutkus89.licenseOnly:libpng:'
     implementation 'com.viliussutkus89.licenseOnly:OpenJPEG:2.4.0'
     implementation 'com.viliussutkus89.licenseOnly:LibTIFF:4.1.0'
     implementation 'com.viliussutkus89.licenseOnly:poppler-data:0.4.9'
@@ -87,7 +87,7 @@ dependencies {
     implementation 'com.viliussutkus89.licenseOnly:libiconv:1.16'
 
     // Dependencies of pixman
-    implementation 'com.viliussutkus89.licenseOnly:libpng:1.6.37'
+//    implementation 'com.viliussutkus89.licenseOnly:libpng:'
 //    implementation 'com.viliussutkus89.licenseOnly:GLib:'
 
     // Dependencies of libpng
@@ -120,7 +120,7 @@ dependencies {
     // Dependencies of OpenJPEG
 //    implementation 'com.viliussutkus89.licenseOnly:LCMS:'
 //    implementation 'com.viliussutkus89.licenseOnly:libjpeg-turbo:'
-    implementation 'com.viliussutkus89.licenseOnly:libpng:1.6.37'
+//    implementation 'com.viliussutkus89.licenseOnly:libpng:'
     implementation 'com.viliussutkus89.licenseOnly:LibTIFF:4.1.0'
 
     // Dependencies of LibTIFF