[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/libwebp/all/patches/1.3.1-0001-fix-cmake.patch

@@ -0,0 +1,21 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index ad5e14c3..89c836f3 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -58,7 +58,6 @@ if(WEBP_LINK_STATIC)
+   else()
+     set(CMAKE_FIND_LIBRARY_SUFFIXES .a ${CMAKE_FIND_LIBRARY_SUFFIXES})
+   endif()
+-  set(CMAKE_POSITION_INDEPENDENT_CODE ON)
+   # vwebp does not compile on Ubuntu with static libraries so disabling it for
+   # now.
+   set(WEBP_BUILD_VWEBP OFF)
+@@ -153,7 +152,7 @@ endif()
+ set(PTHREAD_LIBS ${CMAKE_THREAD_LIBS_INIT})
+ set(INSTALLED_LIBRARIES)
+ 
+-if(MSVC)
++if(0)
+   # match the naming convention used by nmake
+   set(webp_libname_prefix "lib")
+   set(CMAKE_SHARED_LIBRARY_PREFIX "${webp_libname_prefix}")