OpenCollada: use system zlib.

Fixes #4685.

media-libs/opencollada/opencollada-1.6.68.recipe

@@ -5,9 +5,9 @@ otherwise store their assets in incompatible file formats. COLLADA documents \
 that describe digital assets are XML files, usually identified with a .dae \
 (digital asset exchange) filename extension."
 HOMEPAGE="http://www.opencollada.org/"
-COPYRIGHT="2013 The Khronos Group Inc."
+COPYRIGHT="2013-2018 The Khronos Group Inc."
 LICENSE="MIT"
-REVISION="1"
+REVISION="2"
 SOURCE_URI="https://github.com/KhronosGroup/OpenCOLLADA/archive/v$portVersion.tar.gz"
 CHECKSUM_SHA256="d9db0c0a518aa6ac0359626f222707c6ca1b63a83cbf229d97a5999c9cde347b"
 SOURCE_FILENAME="opencollada-$portVersion.tar.gz"
@@ -28,7 +28,6 @@ PROVIDES="
 	lib:libOpenCOLLADASaxFrameworkLoader$secondaryArchSuffix = $portVersion
 	lib:libOpenCOLLADAStreamWriter$secondaryArchSuffix = $portVersion
 	lib:libUTF$secondaryArchSuffix = $portVersion
-	lib:libzlib$secondaryArchSuffix = $portVersion
 	"
 REQUIRES="
 	haiku$secondaryArchSuffix
@@ -48,7 +47,6 @@ PROVIDES_devel="
 	devel:libOpenCOLLADASaxFrameworkLoader$secondaryArchSuffix = $portVersion
 	devel:libOpenCOLLADAStreamWriter$secondaryArchSuffix = $portVersion
 	devel:libUTF$secondaryArchSuffix = $portVersion
-	devel:libzlib$secondaryArchSuffix = $portVersion
 	"
 REQUIRES_devel="
 	opencollada$secondaryArchSuffix == $portVersion base
@@ -59,6 +57,7 @@ BUILD_REQUIRES="
 	devel:libpcre$secondaryArchSuffix
 	devel:libpcreposix$secondaryArchSuffix
 	devel:libxml2$secondaryArchSuffix
+	devel:libz$secondaryArchSuffix
 	"
 BUILD_PREREQUIRES="
 	cmd:cmake
@@ -76,8 +75,7 @@ defineDebugInfoPackage opencollada$secondaryArchSuffix \
 	$libDir/libOpenCOLLADAFramework.so \
 	$libDir/libOpenCOLLADASaxFrameworkLoader.so \
 	$libDir/libOpenCOLLADAStreamWriter.so \
-	$libDir/libUTF.so \
-	$libDir/libzlib.so
+	$libDir/libUTF.so
 
 PATCH()
 {
@@ -90,8 +88,7 @@ BUILD()
 	mkdir -p build
 	cd build
 	cmake  .. \
-		-DCMAKE_CXX_FLAGS="-D_BSD_SOURCE" \
-		-DUSE_SHARED=ON \
+		-DUSE_SHARED=ON -DUSE_STATIC=OFF\
 		$cmakeDirArgs
 
 	make $jobArgs
@@ -111,8 +108,7 @@ INSTALL()
 		libOpenCOLLADAFramework \
 		libOpenCOLLADASaxFrameworkLoader \
 		libOpenCOLLADAStreamWriter \
-		libUTF \
-		libzlib
+		libUTF
 
 	packageEntries devel \
 		$developDir \