Single source of truth for library versions

cmake/libraries/all.cmake

@@ -1,3 +1,12 @@
+# Import variables from misc/lib-versions.sh
+file(STRINGS ${CMAKE_SOURCE_DIR}/misc/lib-versions.sh LIB_VERSIONS_CONTENT
+    REGEX "^[A-Z_]+=[^ ]+")
+foreach(LINE ${LIB_VERSIONS_CONTENT})
+    if(LINE MATCHES "^([A-Z_]+)=(.+)$")
+        set(${CMAKE_MATCH_1} ${CMAKE_MATCH_2})
+    endif()
+endforeach()
+
 include(libraries/curl)
 include(libraries/freetype)
 include(libraries/jpeg)