FindSQLite3: Add SQLite::SQLite3 ALIAS for compatibility with CMake's…

… upstream FindSQLite3

Workaround for gazebosim#312 .

Signed-off-by: Silvio <silvio@traversaro.it>

cmake/FindSQLite3.cmake

@@ -23,6 +23,8 @@
 # Variables defined by this module:
 #
 # SQLite3::SQLite3          Imported target for sqlite3
+# SQLite::SQLite3           Imported target for sqlite3, for
+#                           compatibility with upstream CMake
 # SQLite3_FOUND             System has sqlite3 library and headers
 
 if(SQLite3_FIND_VERSION)
@@ -54,3 +56,8 @@ if(MSVC)
   ign_import_target(SQLite3)
 
 endif()
+
+# Workaround for https://github.com/gazebosim/gz-cmake/issues/312
+if(TARGET SQLite3::SQLite3 AND NOT TARGET SQLite::SQLite3)
+  add_library(SQLite::SQLite3 ALIAS SQLite3::SQLite3)
+endif()