main/ngrep: fix build with gcc 14

main/ngrep/APKBUILD

@@ -3,7 +3,7 @@
 pkgname=ngrep
 pkgver=1.47
 _pkgver="${pkgver/./_}"
-pkgrel=3
+pkgrel=4
 pkgdesc="A grep-like utility that allows you to search for network packets on an interface"
 url="https://ngrep.sourceforge.net/"
 arch="all"
@@ -23,7 +23,7 @@ prepare() {
 build() {
 	export EXTRA_INCLUDES=$(pcre-config --cflags)
 	export EXTRA_LIBS=$(pcre-config --libs)
-	./configure \
+	CFLAGS="$CFLAGS -DSTDC_HEADERS" ./configure \
 		--build=$CBUILD \
 		--host=$CHOST \
 		--prefix=/usr \