Fix build failure with minizip >= 1.3.1.2:

code/Common/ZipArchiveIOSystem.cpp:57:14: fatal error: 'unzip.h' file not found
#    include <unzip.h>
             ^~~~~~~~~

https://github.com/assimp/assimp/issues/6576
--- CMakeLists.txt
+++ CMakeLists.txt
@@ -550,11 +550,17 @@
 IF( NOT IOS )
   IF( NOT ASSIMP_BUILD_MINIZIP )
     use_pkgconfig(UNZIP minizip)
+    IF(${UNZIP_VERSION} VERSION_GREATER_EQUAL "1.3.1.2")
+      add_definitions(-DMINIZIP1_3_1_2)
+    ENDIF()
   ENDIF()
 ELSE ()
   IF( NOT BUILD_SHARED_LIBS )
     IF( NOT ASSIMP_BUILD_MINIZIP )
       use_pkgconfig(UNZIP minizip)
+      IF(${UNZIP_VERSION} VERSION_GREATER_EQUAL "1.3.1.2")
+        add_definitions(-DMINIZIP1_3_1_2)
+      ENDIF()
     ENDIF()
   ENDIF ()
 ENDIF ()
--- code/AssetLib/IFC/IFCLoader.cpp
+++ code/AssetLib/IFC/IFCLoader.cpp
@@ -50,7 +50,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <tuple>
 
 #ifndef ASSIMP_BUILD_NO_COMPRESSED_IFC
-#ifdef ASSIMP_USE_HUNTER
+#if defined(ASSIMP_USE_HUNTER) || defined(MINIZIP1_3_1_2)
 #include <minizip/unzip.h>
 #else
 #include <unzip.h>
--- code/Common/ZipArchiveIOSystem.cpp
+++ code/Common/ZipArchiveIOSystem.cpp
@@ -51,7 +51,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <map>
 #include <memory>
 
-#ifdef ASSIMP_USE_HUNTER
+#if defined(ASSIMP_USE_HUNTER) || defined(MINIZIP1_3_1_2)
 #    include <minizip/unzip.h>
 #else
 #    include <unzip.h>