[DO-971] ffmpeg recipe with requirements (!9)

Co-authored-by: aleksandr.vodyanov <aleksandr.vodyanov@avroid.tech>
Reviewed-on: https://git.avroid.tech/Conan/conan_build/pulls/9

recipes/vorbis/all/patches/1.3.6-0001-link-libm-find-package-ogg.patch

@@ -0,0 +1,56 @@
+Backport in 1.3.6 some build improvements of 1.3.7:
+* link to libm
+* usage of find_package to discover Ogg and link with Ogg:ogg target
+
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -4,6 +4,7 @@ project(vorbis)
+ # Required modules
+ include(GNUInstallDirs)
+ include(CheckIncludeFiles)
++include(CheckLibraryExists)
+ 
+ # Build options
+ option(BUILD_SHARED_LIBS "Build shared library" OFF)
+@@ -52,18 +53,12 @@ endfunction()
+ 
+ message(STATUS "Configuring ${PROJECT_NAME} ${PROJECT_VERSION}")
+ 
++# Find math library
++
++check_library_exists(m floor "" HAVE_LIBM)
++
+ # Find ogg dependency
+-if(NOT OGG_ROOT)
+-    find_package(PkgConfig QUIET)
+-    pkg_check_modules(PC_OGG QUIET ogg)
+-    find_path(OGG_INCLUDE_DIRS NAMES ogg/ogg.h HINTS ${PC_OGG_INCLUDE_DIRS} PATH_SUFFIXES ogg)
+-    find_library(OGG_LIBRARIES NAMES ogg HINTS ${PC_OGG_LIBRARY_DIRS})
+-else()
+-    find_path(OGG_INCLUDE_DIRS NAMES ogg/ogg.h HINTS ${OGG_ROOT}/include PATH_SUFFIXES ogg)
+-    find_library(OGG_LIBRARIES NAMES ogg HINTS ${OGG_ROOT}/lib ${OGG_ROOT}/lib64)
+-endif()
+-include(FindPackageHandleStandardArgs)
+-find_package_handle_standard_args(OGG DEFAULT_MSG OGG_INCLUDE_DIRS OGG_LIBRARIES)
++find_package(Ogg REQUIRED)
+ 
+ add_subdirectory(lib)
+ 
+--- a/lib/CMakeLists.txt
++++ b/lib/CMakeLists.txt
+@@ -83,9 +83,12 @@ if (NOT BUILD_FRAMEWORK)
+     get_version_info(VORBISFILE_VERSION_INFO "VF_LIB_CURRENT" "VF_LIB_AGE" "VF_LIB_REVISION")
+     set_target_properties(vorbisfile PROPERTIES SOVERSION ${VORBISFILE_VERSION_INFO})
+ 
+-    target_link_libraries(vorbis ${OGG_LIBRARIES})
+-    target_link_libraries(vorbisenc ${OGG_LIBRARIES} vorbis)
+-    target_link_libraries(vorbisfile ${OGG_LIBRARIES} vorbis)
++    target_link_libraries(vorbis
++        PUBLIC Ogg::ogg
++        PRIVATE $<$<BOOL:${HAVE_LIBM}>:m>
++    )
++    target_link_libraries(vorbisenc PUBLIC vorbis)
++    target_link_libraries(vorbisfile PUBLIC vorbis)
+ 
+     install(FILES ${VORBIS_PUBLIC_HEADERS} DESTINATION ${CMAKE_INSTALL_FULL_INCLUDEDIR}/vorbis)
+