rust: handle windows naming change from .lib to .a

Prior to Rust 1.44, Cargo would name static libs with the .lib
extension. 1.44 changes this extension to .a when running under
a GNU environment on Windows like msys to make it more similar
to other unix environments.

Now assume static library name to be the same on Windows and
unix, but rename the .lib if found to still support older
versions of Rust on Windows.

configure.ac

@@ -306,7 +306,6 @@
             WINDOWS_PATH="yes"
             PCAP_LIB_NAME="wpcap"
             AC_DEFINE([HAVE_NON_POSIX_MKDIR], [1], [mkdir is not POSIX compliant: single arg])
-            RUST_SURICATA_LIBNAME="suricata.lib"
             RUST_LDADD=" -lws2_32 -liphlpapi -lwbemuuid -lOle32 -lOleAut32 -lUuid -luserenv -lshell32 -ladvapi32 -lgcc_eh"
             ;;
         *-*-cygwin)
@@ -2500,10 +2499,11 @@ fi
     fi
 
     if test "x$enable_debug" = "xyes"; then
-      RUST_SURICATA_LIB="../rust/target/${RUST_SURICATA_LIB_XC_DIR}debug/${RUST_SURICATA_LIBNAME}"
+      RUST_SURICATA_LIBDIR="../rust/target/${RUST_SURICATA_LIB_XC_DIR}debug"
     else
-      RUST_SURICATA_LIB="../rust/target/${RUST_SURICATA_LIB_XC_DIR}release/${RUST_SURICATA_LIBNAME}"
+      RUST_SURICATA_LIBDIR="../rust/target/${RUST_SURICATA_LIB_XC_DIR}release"
     fi
+    RUST_SURICATA_LIB="${RUST_SURICATA_LIBDIR}/${RUST_SURICATA_LIBNAME}"
 
     RUST_LDADD="${RUST_SURICATA_LIB} ${RUST_LDADD}"
     CFLAGS="${CFLAGS} -I\${srcdir}/../rust/gen -I\${srcdir}/../rust/dist"
@@ -2780,6 +2780,7 @@ AC_SUBST(CONFIGURE_LOCALSTATEDIR)
 AC_SUBST(CONFIGURE_DATAROOTDIR)
 AC_SUBST(PACKAGE_VERSION)
 AC_SUBST(RUST_FEATURES)
+AC_SUBST(RUST_SURICATA_LIBDIR)
 
 AC_CONFIG_FILES(Makefile src/Makefile rust/Makefile rust/Cargo.toml rust/.cargo/config)
 AC_CONFIG_FILES(qa/Makefile qa/coccinelle/Makefile)

rust/Makefile.am

@@ -45,6 +45,10 @@ else
 		$(CARGO) build $(RELEASE) $(NIGHTLY_ARGS) \
 			--features "$(RUST_FEATURES)" $(RUST_TARGET)
 endif
+	if test -e $(RUST_SURICATA_LIBDIR)/suricata.lib; then \
+		cp $(RUST_SURICATA_LIBDIR)/suricata.lib \
+			$(RUST_SURICATA_LIBDIR)/libsuricata.a; \
+	fi
 	$(MAKE) gen/rust-bindings.h
 
 clean-local: