gfortran: update runtime dependencies

It fails to run both `gcc` and `gfortran` with errors:

| root@qemux86-64:~# x86_64-poky-linux-gcc a.c
| x86_64-poky-linux-gcc: fatal error: cannot execute 'as': posix_spawnp: No such file or directory

then add binutils which provides `as` to RDEPENDS of gcc.

libgfortran-dev provides libgfortran.spec which required by gfortran:

| root@qemux86-64:~# gfortran hello.f95
| gfortran: fatal error: cannot read spec file 'libgfortran.spec': No such file or directory

And gcc provides liblto_plugin.so:

| root@qemux86-64:~# gfortran hello.f95
| gfortran: fatal error: '-fuse-linker-plugin', but liblto_plugin.so not found

(From OE-Core rev: 44fc7aa1468ff042739cc5a91c84ef5c2a09e0a3)

Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/gcc/gcc-target.inc

@@ -33,7 +33,7 @@ PACKAGES = "\
     ${PN} ${PN}-plugins ${PN}-symlinks \
     g++ g++-symlinks \
     cpp cpp-symlinks \
-    gfortran gfortran-symlinks \
+    ${@bb.utils.contains('FORTRAN', ',fortran', 'gfortran gfortran-symlinks', '', d)} \
     gcov gcov-symlinks \
     ${PN}-doc \
     ${PN}-dev \
@@ -60,7 +60,7 @@ RRECOMMENDS:${PN} += "\
     libssp \
     libssp-dev \
 "
-RDEPENDS:${PN} += "cpp"
+RDEPENDS:${PN} += "binutils cpp"
 
 FILES:${PN}-dev = "\
     ${gcclibdir}/${TARGET_SYS}/${BINV}/lib*${SOLIBSDEV} \
@@ -80,10 +80,15 @@ FILES:${PN}-plugins = "\
 "
 ALLOW_EMPTY:${PN}-plugins = "1"
 
+INSANE_SKIP:${MLPREFIX}gfortran += "dev-deps"
 FILES:gfortran = "\
     ${bindir}/${TARGET_PREFIX}gfortran \
     ${libexecdir}/gcc/${TARGET_SYS}/${BINV}/f951 \
 "
+RDEPENDS:gfortran = "\
+    gcc \
+    libgfortran-dev \
+"
 RRECOMMENDS:gfortran = "\
     libquadmath \
     libquadmath-dev \