If `OpenACC_C_FLAGS` contains `-h acc`, the flag pair needs to
be preserved as a shell command fragment, and must not be split by
de-duplication with other `target_compile_options`.
Fixes: #24963
Modify some additional modules that ship with CMake to use the new
SOURCES_FROM_* arguments to try_compile / try_run as added by commits
cb14ae2b87 (try_compile: Add SOURCE_FROM_{ARG,VAR}, 2022-09-21) and
611d801790 (try_compile: Add SOURCE_FROM_FILE, 2022-09-22). This covers
modules that need to read and alter a template source file, which were
not addressed in the previous commit.
Note that FindOpenACC.cmake does not actually need configure_file
functionality; it appears to have inherited the (gratuitous) use thereof
from FindOpenMP.cmake, with which its code bears significant similarity.
Modify most of the modules that ship with CMake to use the new
try_compile / try_run signatures added by commit aa9220d3a0
(try_compile: Add keyword-dispatched signature, 2022-09-02). This
improves debugging by each invocation using its own directory so that
the results of multiple invocations can be retained.
This does not cover any invocations which provide an entire project, as
that flavor of try_compile has not yet been updated.
Previously the FindOpenACC module had issues where the contents of
OpenACC_<lang>_FLAGS could not be used with target_compile_options
when it contained multiple compiler flags.
The original Fortran snippet would fail to compile with the error
message of:
```
return 0;
1
Error: Alternate RETURN statement at (1) is only allowed within a SUBROUTINE
```
We solve this by removing the early termination logic.
