[interop][shared] introduce depends field of DefFile for declaring library dependencies

diff --git a/klib/src/platform/osx/objc.def b/klib/src/platform/osx/objc.def
index 9631fe3b..510de838 100644
--- a/klib/src/platform/osx/objc.def
+++ b/klib/src/platform/osx/objc.def
@@ -7,6 +7,6 @@ headers = objc/List.h objc/NSObjCRuntime.h objc/NSObject.h objc/Object.h objc/Pr

 compilerOpts = -D_XOPEN_SOURCE
 linkerOpts = -lobjc
-
+depends = osx posix
 ---
 // objc-auto.h is excluded so far due to interop issues.
diff --git a/klib/src/platform/osx/osx.def b/klib/src/platform/osx/osx.def
index 8dfd8116..6573dc0c 100644
--- a/klib/src/platform/osx/osx.def
+++ b/klib/src/platform/osx/osx.def
@@ -28,6 +28,7 @@ headers = AppleTextureEncoder.h AssertMacros.h Availability.h AvailabilityIntern

 compilerOpts = -D_XOPEN_SOURCE
 linkerOpts = -ldl -lz
+depends = posix

 ---

diff --git a/klib/src/platform/osx/zlib.def b/klib/src/platform/osx/zlib.def
index 46ed691d..e3cab7ba 100644
--- a/klib/src/platform/osx/zlib.def
+++ b/klib/src/platform/osx/zlib.def
@@ -1,3 +1,4 @@
 package = platform.zlib
 headers = zconf.h zlib.h
 linkerOpts = -lz
+depends=posix

shared/src/main/kotlin/org/jetbrains/kotlin/konan/util/DefFile.kt

@@ -71,6 +71,10 @@ class DefFile(val file:File?, val config:DefFileConfig, val manifestAddendProper
         val nonStrictEnums by lazy {
             properties.getSpaceSeparated("nonStrictEnums")
         }
+
+        val depends by lazy {
+            properties.getSpaceSeparated("depends")
+        }
     }
 }