dev-libs/sentry-native: make installed cmake modules handle USE=breakpad

Looks like upstream has only tested this for bundled breakpad.

Closes: https://bugs.gentoo.org/912886
Signed-off-by: Marek Szuba <marecki@gentoo.org>

dev-libs/sentry-native/files/sentry-native-0.6.5_cmake-breakpad.patch

@@ -0,0 +1,14 @@
+--- a/sentry-config.cmake.in
++++ b/sentry-config.cmake.in
+@@ -3,7 +3,10 @@
+ set(SENTRY_BACKEND @SENTRY_BACKEND@)
+ set(SENTRY_TRANSPORT @SENTRY_TRANSPORT@)
+ 
+-if(SENTRY_BACKEND STREQUAL "crashpad")
++if(SENTRY_BACKEND STREQUAL "breakpad")
++	find_package(PkgConfig REQUIRED)
++	pkg_check_modules(BREAKPAD REQUIRED IMPORTED_TARGET breakpad-client)
++elseif(SENTRY_BACKEND STREQUAL "crashpad")
+ 	if(@SENTRY_CRASHPAD_SYSTEM@)
+ 		find_package(crashpad REQUIRED)
+ 	else()

dev-libs/sentry-native/sentry-native-0.6.5-r1.ebuild

@@ -17,12 +17,16 @@ IUSE="+breakpad +curl test"
 RESTRICT="!test? ( test )"
 
 RDEPEND="
-	breakpad? ( dev-util/breakpad )
+	breakpad? (
+		dev-util/breakpad
+		virtual/pkgconfig
+	)
 	curl? ( net-misc/curl )
 "
 DEPEND="${RDEPEND}"
 
 PATCHES=(
+	"${FILESDIR}"/${PN}-0.6.5_cmake-breakpad.patch
 	"${FILESDIR}"/${PN}-0.6.5_no-fuzz-test.patch
 )