net-analyzer/sslsplit: use pkgconfig to detect libnet

SSLsplit uses custom localization of libnet library which does not work
correctly in multilib environment. This commit fixes the issue by
restoring pkgconfig detection from upstream commit 46a55de8040a
("Refactor location of packages, improve libnet detection"). Similar
patch is also needed for tests, where libcrypto is also searched with
pkgconfig.

Closes: https://bugs.gentoo.org/731190
Closes: https://bugs.gentoo.org/874075
Signed-off-by: Petr Vaněk <arkamar@atlas.cz>

net-analyzer/sslsplit/files/sslsplit-0.5.5-libcrypto-pkgconfig.patch

@@ -0,0 +1,23 @@
+Use pkgconfig for localization of libcrypto. This is needed for tests in
+multilib systems.
+
+diff --git a/extra/engine/GNUmakefile b/extra/engine/GNUmakefile
+index b50717b..3712ad6 100644
+--- a/extra/engine/GNUmakefile
++++ b/extra/engine/GNUmakefile
+@@ -16,9 +16,9 @@ else
+ SUFFIX:=	so
+ endif
+
+-CFLAGS+=	-fPIC -I$(OPENSSL_BASE)/include
+-LDFLAGS+=	-L$(OPENSSL_BASE)/lib
+-LIBS+=		-lcrypto
++CFLAGS+=	-fPIC $(shell pkg-config --cflags libcrypto)
++LDFLAGS+=	$(shell pkg-config --libs-only-L libcrypto)
++LIBS+=		$(shell pkg-config --libs-only-l libcrypto)
+
+ TARGET=		dummy-engine
+
+-- 
+2.35.1
+

net-analyzer/sslsplit/files/sslsplit-0.5.5-libnet-pkgconfig.patch

@@ -0,0 +1,40 @@
+Subject: [PATCH] locate libnet with pkgconfig
+
+This is partially reverted from upstream commit 46a55de8040a ("Refactor
+location of packages, improve libnet detection")
+
+diff --git a/GNUmakefile b/GNUmakefile
+index cc7197e..2343272 100644
+--- a/GNUmakefile
++++ b/GNUmakefile
+@@ -277,6 +277,10 @@ PKGS+=		$(shell $(PKGCONFIG) $(PCFLAGS) --exists libevent_openssl \
+ PKGS+=		$(shell $(PKGCONFIG) $(PCFLAGS) --exists libevent_pthreads \
+ 		&& echo libevent_pthreads)
+ endif
++ifndef LIBNET_BASE
++PKGS+=         $(shell $(PKGCONFIG) $(PCFLAGS) --exists libnet \
++		&& echo libnet)
++endif
+ ifneq ($(filter -DWITHOUT_MIRROR,$(FEATURES)),-DWITHOUT_MIRROR)
+ ifndef LIBPCAP_BASE
+ PKGS+=		$(shell $(PKGCONFIG) $(PCFLAGS) --exists libpcap \
+@@ -333,7 +337,7 @@ CHECK_MISSING:=	1
+ endif
+ endif
+
+-# Always search filesystem for libnet because libnet-config is unreliable
++ifeq (,$(filter libnet,$(PKGS)))
+ ifneq ($(filter -DWITHOUT_MIRROR,$(FEATURES)),-DWITHOUT_MIRROR)
+ LIBNET_FOUND:=	$(call locate,libnet,include/libnet-1.1/libnet.h,$(LIBNET_BASE))
+ ifdef LIBNET_FOUND
+@@ -347,6 +351,7 @@ $(error dependency 'libnet' not found; \
+ 	install it or point LIBNET_BASE to base path)
+ endif
+ endif
++endif
+
+ ifdef OPENSSL_FOUND
+ PKG_CPPFLAGS+=	-I$(OPENSSL_FOUND)/include
+-- 
+2.35.1
+

net-analyzer/sslsplit/sslsplit-0.5.5.ebuild

@@ -35,7 +35,11 @@ DEPEND="${RDEPEND}
 	test? ( dev-libs/check )"
 BDEPEND="virtual/pkgconfig"
 
-PATCHES=( "${FILESDIR}/${P}-openssl3.patch" )
+PATCHES=(
+	"${FILESDIR}/${P}-openssl3.patch"
+	"${FILESDIR}/${P}-libnet-pkgconfig.patch"
+	"${FILESDIR}/${P}-libcrypto-pkgconfig.patch"
+)
 
 src_prepare() {
 	default