dev-cpp/sdbus-c++: Fix pkg-config dep on libsystemd when statically linked

Closes: https://bugs.gentoo.org/865389
Signed-off-by: James Le Cuirot <chewi@gentoo.org>

dev-cpp/sdbus-c++/files/sdbus-c++-pc-reqs.patch

@@ -0,0 +1,29 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 0733b41..fd613be 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -210,6 +210,11 @@ install(FILES ${CMAKE_CURRENT_BINARY_DIR}/cmake/sdbus-c++-config.cmake
+         DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/sdbus-c++
+         COMPONENT dev)
+ 
++if(BUILD_LIBSYSTEMD OR pkgcfg_lib_Systemd_systemd MATCHES "\.a$")
++    set(PKGCONFIG_REQS "")
++else()
++    set(PKGCONFIG_REQS "libsystemd")
++endif()
+ configure_file(pkgconfig/sdbus-c++.pc.in pkgconfig/sdbus-c++.pc @ONLY)
+ install(FILES ${CMAKE_CURRENT_BINARY_DIR}/pkgconfig/sdbus-c++.pc
+         DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig COMPONENT dev)
+diff --git a/pkgconfig/sdbus-c++.pc.in b/pkgconfig/sdbus-c++.pc.in
+index 21e0f0b..a6d6ec9 100644
+--- a/pkgconfig/sdbus-c++.pc.in
++++ b/pkgconfig/sdbus-c++.pc.in
+@@ -5,7 +5,7 @@ includedir=@CMAKE_INSTALL_FULL_INCLUDEDIR@
+ 
+ Name: @PROJECT_NAME@
+ Description: C++ library on top of sd-bus, a systemd D-Bus library
+-Requires: libsystemd
++Requires: @PKGCONFIG_REQS@
+ Version: @SDBUSCPP_VERSION@
+ Libs: -L${libdir} -l@PROJECT_NAME@
+ Cflags: -I${includedir}

dev-cpp/sdbus-c++/sdbus-c++-0.9.0-r4.ebuild

@@ -58,6 +58,10 @@ S="${WORKDIR}/sdbus-cpp-${PV}"
 SDS="${WORKDIR}/${SDP}"
 SDB="${WORKDIR}/systemd-build"
 
+PATCHES=(
+	"${FILESDIR}"/${PN}-pc-reqs.patch
+)
+
 pkg_setup() {
 	use systemd || python-any-r1_pkg_setup
 }

dev-cpp/sdbus-c++/sdbus-c++-1.2.0.ebuild

@@ -58,6 +58,10 @@ S="${WORKDIR}/sdbus-cpp-${PV}"
 SDS="${WORKDIR}/${SDP}"
 SDB="${WORKDIR}/systemd-build"
 
+PATCHES=(
+	"${FILESDIR}"/${PN}-pc-reqs.patch
+)
+
 pkg_setup() {
 	use systemd || python-any-r1_pkg_setup
 }