Partially revert #42919

[ararslan]

The change to RPATH setting for macOS seems to have improved the situation for users on Monterey, but the other changes in #42919 that affect other platforms seem to have caused regressions on musl Linux (#42940) and FreeBSD (#42944). The easiest thing to do here is to keep the changes from #42919 as they apply to macOS but revert the others.

Fixes #42940
Fixes #42944

[DilumAluthge]

If you look at the logs, in its current state (86c2d80) this PR fixes both musl64 and freebsd64.

[DilumAluthge]

In its current state (023d4ca) this PR fixes both musl64 and freebsd64.

[ararslan]

Just a note in case anyone is wondering whether this will impact the fixes for macOS Monterey: The full conditional is

julia/Make.inc

Lines 1189 to 1205 in 023d4ca

	# shared library runtime paths
	ifneq (,$(filter $(OS),WINNT emscripten))
	RPATH :=
	RPATH_ORIGIN :=
	RPATH_ESCAPED_ORIGIN :=
	RPATH_LIB :=
	else ifeq ($(OS), Darwin)
	RPATH := -Wl,-rpath,'@executable_path/$(build_libdir_rel)'
	RPATH_ORIGIN := -Wl,-rpath,'@loader_path/'
	RPATH_ESCAPED_ORIGIN := $(RPATH_ORIGIN)
	RPATH_LIB := -Wl,-rpath,'@loader_path/'
	else
	RPATH := -Wl,-rpath,'$$ORIGIN/$(build_libdir_rel)' -Wl,-rpath,'$$ORIGIN/$(build_private_libdir_rel)' -Wl,-rpath-link,$(build_shlibdir) -Wl,-z,origin
	RPATH_ORIGIN := -Wl,-rpath,'$$ORIGIN' -Wl,-z,origin
	RPATH_ESCAPED_ORIGIN := -Wl,-rpath,'\$$\$$ORIGIN' -Wl,-z,origin -Wl,-rpath-link,$(build_shlibdir)
	RPATH_LIB := -Wl,-rpath,'$$ORIGIN/' -Wl,-z,origin
	endif

. Note though that the changes in this PR only touch that final else block,

julia/Make.inc

Lines 1200 to 1205 in 023d4ca

	else
	RPATH := -Wl,-rpath,'$$ORIGIN/$(build_libdir_rel)' -Wl,-rpath,'$$ORIGIN/$(build_private_libdir_rel)' -Wl,-rpath-link,$(build_shlibdir) -Wl,-z,origin
	RPATH_ORIGIN := -Wl,-rpath,'$$ORIGIN' -Wl,-z,origin
	RPATH_ESCAPED_ORIGIN := -Wl,-rpath,'\$$\$$ORIGIN' -Wl,-z,origin -Wl,-rpath-link,$(build_shlibdir)
	RPATH_LIB := -Wl,-rpath,'$$ORIGIN/' -Wl,-z,origin
	endif

. That means it actually can't affect macOS. (Also IIUC the syntax for those flags is wrong for macOS, so they wouldn't work even if Mac snuck through to that condition somehow.)