Bug 1618752 - Fix the Windows cross builds so they include MSVC runtime DLLs. r=froydnj

One part is fixing old-configure.in to use `pwd` when `pwd -W` doesn't work
(it errors on Linux), and another part is supporting two additional
system calls in liblowercase:
- chdir used in the same commands as the `pwd -W` fix
- symlink, used by the install manifest processor to create symbolic
links of those DLLs in $MOZ_OBJDIR/dist/bin.

Differential Revision: https://phabricator.services.mozilla.com/D64707

--HG--
extra : moz-landing-system : lando

build/liblowercase/lib.rs

@@ -243,4 +243,8 @@ wrappers! {
     fn access(path: *const c_char, mode: c_int) -> c_int;
 
     fn mkdir(path: *const c_char, mode: libc::mode_t) -> c_int;
+
+    fn chdir(path: *const c_char) -> c_int;
+
+    fn symlink(target: *const c_char, linkpath: *const c_char) -> c_int;
 }

old-configure.in

@@ -169,7 +169,7 @@ case "$target" in
           if test ! -d "$WIN_UCRT_REDIST_DIR"; then
             AC_MSG_ERROR([Invalid Windows UCRT Redist directory: ${WIN_UCRT_REDIST_DIR}])
           fi
-          WIN_UCRT_REDIST_DIR=`cd "$WIN_UCRT_REDIST_DIR" && pwd -W`
+          WIN_UCRT_REDIST_DIR=`cd "$WIN_UCRT_REDIST_DIR" && (pwd -W 2>/dev/null || pwd)`
         fi
 
         AC_SUBST(MSVC_C_RUNTIME_DLL)
@@ -181,7 +181,7 @@ case "$target" in
           if test ! -d "$WIN32_REDIST_DIR"; then
             AC_MSG_ERROR([Invalid Win32 Redist directory: ${WIN32_REDIST_DIR}])
           fi
-          WIN32_REDIST_DIR=`cd "$WIN32_REDIST_DIR" && pwd -W`
+          WIN32_REDIST_DIR=`cd "$WIN32_REDIST_DIR" && (pwd -W 2>/dev/null || pwd)`
         fi
 
         # Check linker version, except in lld builds