mingw-ldd

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Avoid the use of GNU-specific awk extensions.

* mingw32-ldd.sh (list_depends): Do not depend on the effect of...
(IGNORECASE): ...this awk variable; it is a GNU extension; prefer...
[tolower($0) ~ /pattern/]: ...this POSIX.1 standard construct.

Support a configurable command name host prefix.

* mingw32-ldd.sh (rcinit): Add fall-back initialization for...
(mingw32): ...this new script variable; derive its default value from
the effective basename of this mingw32-ldd command, omitting "-ldd".
(objdump): Use it as a possible cross-tool host prefix.

Adopt a consistent style for shell function definitions.

* mingw32-ldd.sh (usage, set_dllpath, depends, list_depends)
(plot_depends, ref_count, ref_shift, plot_linkage, show_depends):
Insert white-space between '()' and '{'; some shells may object,
when it is omitted.

Support persistent user-specific run-time initialization.

* mingw32-ldd.sh (rcinit): New function; it provides fall-backs...
(SYSTEM_DLLPATH, PROGRAM_FILES): ...for these shell variables, after
reading preferred settings from $HOME/.mingw32rc; use it.

Use mingw32-specific objdump command, if available.

* mingw32-ldd.sh (objdump): New script variable; define, and...
(list_depends): ...use it.

Diagnose missing files at top level.

* mingw32-ldd.sh (show_depends): Rename original function...
(plot_depends): ...as this; use it in reimplementation, as new, of...
(show_depends): ...this; add diagnostics to report missing files.
(CMD): New script variable; define, and use it in diagnostics...
(usage, show_depends): ...in each of these.
(STATUS): New variable.

New repository; initial commit.

* mingw32-ldd.sh: New file; it implements a simple recursive procedure
for plotting the DLL dependency tree for Windows executables or DLLs.