maintainer-feedback requested: [Bug 268366] java/openjdk17: fix build with clang 15

Bugzilla Automation <bugzilla@FreeBSD.org> has asked freebsd-java (Nobody)
<java@FreeBSD.org> for maintainer-feedback:
Bug 268366: java/openjdk17: fix build with clang 15
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268366



--- Description ---
During an exp-run for llvm 15 (see bug 265425), it turned out that
java/openjdk17 failed to build with clang 15:

 
/wrkdirs/usr/ports/java/openjdk17/work/jdk17u-jdk-17.0.5-8-1/src/java.base/unix
/native/libnet/DefaultProxySelector.c:374:41:
error: passing arguments to a function without a prototype is deprecated in all
versions of C and is not supported in C2x [-Werror,-Wdeprecated-non-prototype]
      proxies = (*g_proxy_resolver_lookup)(resolver, uri, NULL, &error);
					  ^
 
/wrkdirs/usr/ports/java/openjdk17/work/jdk17u-jdk-17.0.5-8-1/src/java.base/unix
/native/libnet/DefaultProxySelector.c:393:63:
error: passing arguments to a function without a prototype is deprecated in all
versions of C and is not supported in C2x [-Werror,-Wdeprecated-non-prototype]
				  (*g_network_address_parse_uri)(proxies[i], 0,
								^
 
/wrkdirs/usr/ports/java/openjdk17/work/jdk17u-jdk-17.0.5-8-1/src/java.base/unix
/native/libnet/DefaultProxySelector.c:398:70:
error: passing arguments to a function without a prototype is deprecated in all
versions of C and is not supported in C2x [-Werror,-Wdeprecated-non-prototype]
			      phost = (*g_network_address_get_hostname)(conn);
								       ^
 
/wrkdirs/usr/ports/java/openjdk17/work/jdk17u-jdk-17.0.5-8-1/src/java.base/unix
/native/libnet/DefaultProxySelector.c:399:66:
error: passing arguments to a function without a prototype is deprecated in all
versions of C and is not supported in C2x [-Werror,-Wdeprecated-non-prototype]
			      pport = (*g_network_address_get_port)(conn);
								   ^
 
/wrkdirs/usr/ports/java/openjdk17/work/jdk17u-jdk-17.0.5-8-1/src/java.base/unix
/native/libnet/DefaultProxySelector.c:435:22:
error: passing arguments to a function without a prototype is deprecated in all
versions of C and is not supported in C2x [-Werror,-Wdeprecated-non-prototype]
	  (*g_strfreev)(proxies);
		       ^

This is because clang 15 warns by default about functions without arguments in
their prototypes. Fix this by suppressing the warning.