harfbuzz-config.cmake: support static library build

src/harfbuzz-config.cmake.in

@@ -12,6 +12,9 @@ list(GET _harfbuzz_version_info 2
   _harfbuzz_age)
 unset(_harfbuzz_version_info)
 
+if ("@default_library@" MATCHES "static")
+  set(_harfbuzz_lib_suffix ".a")
+else ()
   if (APPLE)
     set(_harfbuzz_lib_suffix ".0${CMAKE_SHARED_LIBRARY_SUFFIX}")
   elseif (UNIX)
@@ -20,6 +23,7 @@ else ()
     # Unsupported.
     set(harfbuzz_FOUND 0)
   endif ()
+endif ()
 
 # Add the libraries.
 add_library(harfbuzz::harfbuzz SHARED IMPORTED)