fish: enable debug symbols (#8799)

there is already a debug package but without symbols it's useless

app-shells/fish/fish-3.5.1.recipe

@@ -5,7 +5,7 @@ is simple but incompatible with other shell languages."
 HOMEPAGE="https://ridiculousfish.com/shell/"
 COPYRIGHT="2005-2018 Axel Liljencrantz"
 LICENSE="GNU GPL v2"
-REVISION="1"
+REVISION="2"
 SOURCE_URI="https://github.com/fish-shell/fish-shell/releases/download/$portVersion/fish-$portVersion.tar.xz"
 CHECKSUM_SHA256="a6d45b3dc5a45dd31772e7f8dfdfecabc063986e8f67d60bd7ca60cc81db6928"
 PATCHES="fish-$portVersion.patchset"
@@ -56,7 +56,7 @@ BUILD()
 {
 	mkdir -p build && cd build
 	cmake .. \
-		-DCMAKE_BUILD_TYPE=Release \
+		-DCMAKE_BUILD_TYPE=RelWithDebInfo \
 		$cmakeDirArgs
 
 	make $jobArgs