This reverts commit 203d69a3.

Make ENABLE_WASAPI option depend on WIN32 instead of MSVC so that it is enabled even without the compiler detection.

This reverts commit f2b125f5.

ms2.cmake: abort build if trying to build non free codecs without NON_FREE_CODECS option instead of silently deactivating it

ms2.cmake: fix g729 and openamr codecs activation - option must not contain nor '.' nor '-' characters

ms2.cmake: remove DEFAULT_VALUE_ENABLE_XX for non free codecs - by default they are always turned off and user must explicitely activate both ENABLE_NON_FREE_CODECS and non free codecs to avoid any licence issue

ms2.cmake: change ENABLE_NON_FREE_CODECS option behavior - if disabled, build of non free codecs is impossible at all. If you want to build non free codecs, you must enable this option AND enable each codecs individually with -DENABLE_CODEC=YES

ms2.cmake: factorize option code in a single function ms2_add_option. OpenH264 and X264 can be built simultanously.

ms2.cmake: set ENABLE_NON_FREE_CODECS to OFF by default, it must be set by user deliberately (license ack)

ms2.cmake: ENABLE_NON_FREE_CODECS must change only default value for all codecs; it must be still overridable one by one using ENABLE_CODEC=YES for a specific codec

Revert "config-desktop.cmake: fix win32 build by declaring DEFAULT_VALUE_ENABLE_V4L to ON"

This reverts commit a66ab78b.