rust: fix vendor use on MinGW

configure.ac

@@ -85,7 +85,7 @@
     AC_PROG_GREP
 
     AC_PATH_PROG(HAVE_CYGPATH, cygpath, "no")
-    AM_CONDITIONAL([HAVE_CYGPATH], [test "x$enable_cygpath" = "xyes"])
+    AM_CONDITIONAL([HAVE_CYGPATH], [test "x$HAVE_CYGPATH" != "xno"])
 
     AC_PATH_PROG(HAVE_PKG_CONFIG, pkg-config, "no")
     if test "$HAVE_PKG_CONFIG" = "no"; then
@@ -2415,7 +2415,12 @@ fi
     AC_SUBST(RUST_SURICATA_LIB)
     AC_SUBST(RUST_LDADD)
     if test "x$CARGO_HOME" = "x"; then
+        if test "x$HAVE_CYGPATH" != "no"; then
+          CYGPATH_CARGO_HOME=$(cygpath -a -t mixed ~/.cargo)
+          AC_SUBST([CARGO_HOME], [$CYGPATH_CARGO_HOME])
+        else
           AC_SUBST([CARGO_HOME], [~/.cargo])
+        fi
     else
       AC_SUBST([CARGO_HOME], [$CARGO_HOME])
     fi

rust/.cargo/config.in

@@ -5,4 +5,4 @@
 @rust_vendor_comment@replace-with = 'vendored-sources'
 @rust_vendor_comment@
 @rust_vendor_comment@[source.vendored-sources]
-@rust_vendor_comment@directory = '@abs_top_srcdir@/rust/vendor'
+@rust_vendor_comment@directory = '@e_rustdir@/vendor'

rust/Makefile.am

@@ -27,10 +27,9 @@ if HAVE_PYTHON
 	cd $(top_srcdir)/rust && $(HAVE_PYTHON) ./gen-c-headers.py
 endif
 if HAVE_CYGPATH
-	rustpath=`cygpath -a -t mixed $(abs_top_builddir)`
 	@rustup_home@ \
 		CARGO_HOME="$(CARGO_HOME)" \
-		CARGO_TARGET_DIR="$$rustpath/rust/target" \
+		CARGO_TARGET_DIR="$(e_rustdir)/target" \
 		$(CARGO) build $(RELEASE) \
 			--features "$(RUST_FEATURES)" $(RUST_TARGET)
 else