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f9cbeaa033
The recent clang-16 throws errors for implicitly defined functions by
default. In many ./configure tests, an undefined function (which is
"implicitly defined" when you try to call it) is undefined because it
really does not exist. But in one case, utf8_to_mutf7() is undefined
because we forgot to include the header that defines it.
This commit updates the test for utf8_to_mutf7:
* We now include the header (c-client.h) that defines it.
* A "checking... yes/no" message was added to the test.
* The test was switched from PHP_IMAP_TEST_BUILD to AC_COMPILE_IFELSE.
This was the easiest way to avoid a return-type mismatch that runs
afoul of -Werror=implicit-int.
* CPPFLAGS is temporarily amended with the -I flag needed to find
c-client.h.
Fixes GH-10947.
Closes GH-10948
Signed-off-by: George Peter Banyard <girgias@php.net>