Update FindX files

cmake/Findopusfile.cmake

@@ -0,0 +1,64 @@
+# - Try to find opusfile
+# 
+# Once done this will define
+#
+#  OPUSFILE_FOUND        - system has opusfile
+#  OPUSFILE_INCLUDE_DIRS - the opusfile include directories
+#  OPUSFILE_LIBRARIES    - Link these to use opusfile
+#  OPUSFILE_CFLAGS       - Compile options to use opusfile
+#  opusfile::opusfile    - Imported library of opusfile
+#
+
+# FIXME: opusfile does not ship an official opusfile cmake script,
+# rename this file/variables/target when/if it has.
+
+find_package(PkgConfig QUIET)
+if(PKG_CONFIG_FOUND)
+    pkg_search_module(PKG_OPUSFILE "opusfile")
+endif()
+
+find_path(OPUSFILE_INCLUDE_DIR
+    NAMES
+        opusfile.h
+    PATH_SUFFIXES
+        opusfile
+    HINTS
+        ${PKG_OPUSFILE_INCLUDE_DIRS}
+    PATHS
+        /usr/include
+        /usr/local/include
+        /opt/local/include
+        /sw/include
+    )
+
+find_library(OPUSFILE_LIBRARY
+    NAMES
+        opusfile
+    HINTS
+        ${PKG_OPUSFILE_LIBRARIES}
+    PATHS
+        /usr/lib
+        /usr/local/lib
+        /opt/local/lib
+        /sw/lib
+)
+
+set(OPUSFILE_CFLAGS "${PKG_OPUSFILE_CFLAGS_OTHER}" CACHE STRING "CFLAGS of opusfile")
+
+set(OPUSFILE_INCLUDE_DIRS "${OPUSFILE_INCLUDE_DIR}")
+set(OPUSFILE_LIBRARIES "${OPUSFILE_LIBRARY}")
+
+if (OPUSFILE_INCLUDE_DIRS AND OPUSFILE_LIBRARIES)
+set(OPUSFILE_FOUND TRUE)
+endif (OPUSFILE_INCLUDE_DIRS AND OPUSFILE_LIBRARIES)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(opusfile DEFAULT_MSG OPUSFILE_INCLUDE_DIRS OPUSFILE_LIBRARIES)
+
+if(NOT TARGET opusfile::opusfile)
+    add_library(__opusfile INTERFACE)
+    target_compile_options(__opusfile INTERFACE ${OPUSFILE_CFLAGS})
+    target_include_directories(__opusfile INTERFACE ${OPUSFILE_INCLUDE_DIRS})
+    target_link_libraries(__opusfile INTERFACE ${OPUSFILE_LIBRARIES})
+    add_library(opusfile::opusfile ALIAS __opusfile)
+endif()