wvstreams, wvdial: Build with gcc

wvstreams relies on C++ that clang rejects, e.g. access to private and
incomplete nested classes, and so do its headers that wvdial includes.
Upstream is no longer maintained, so build both with gcc when clang is
the default toolchain.

AI-Generated: Uses Claude Code
Signed-off-by: Khem Raj <khem.raj@oss.qualcomm.com>

meta-oe/recipes-connectivity/wvdial/wvdial_1.61.bb

@@ -6,6 +6,9 @@ LIC_FILES_CHKSUM = "file://COPYING.LIB;md5=55ca817ccb7d5b5b66355690e9abc605"
 
 inherit pkgconfig
 
+# wvstreams headers rely on C++ that clang rejects
+TOOLCHAIN = "gcc"
+
 DEPENDS = "wvstreams"
 RDEPENDS:${PN} = "ppp"
 

meta-oe/recipes-connectivity/wvdial/wvstreams_4.6.1.bb

@@ -36,6 +36,9 @@ COMPATIBLE_HOST:libc-musl = "null"
 
 inherit autotools-brokensep pkgconfig
 
+# Relies on C++ that clang rejects
+TOOLCHAIN = "gcc"
+
 TARGET_CFLAGS:append = " -fno-tree-dce -fno-optimize-sibling-calls"
 
 LDFLAGS:append = " -Wl,-rpath-link,${CROSS_DIR}/${TARGET_SYS}/lib"