Signed-off-by: Nikolay Sivov <nsivov@codeweavers.com>

Check the content of the output buffer in addition to checking the
return value.
Also show that multibyte characters are not truncated when the output
buffer is too small.

wine_dbgstr_w() already quotes (and escapes) the string.

This slightly changes ime_ui_update_window to match what was previously
in winex11.drv, since e5f0cdfc, which
seems to be a more recent change.

Showing that they aren't sent to the focused window but only to the
INPUTCONTEXT hWnd member.

Despite the array size, these are considered to be "layered" for the purposes of
GL_FRAMEBUFFER_ATTACHMENT_LAYERED, and mixing array and non-array textures in
this way will trigger GL_FRAMEBUFFER_INCOMPLETE_LAYER_TARGETS.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=49002

With the changes from 9008cd2f.

With the changes from ee7b5ebc.

Rename the musl functions to avoid compiler warnings about the
signature mismatch (double vs. long double).