nodejs: fix target ldflags using

- do not drop target LDFLAGS
  - even if the target LDFLAGS have been specified, tools like torque was
    linked with system libraries

Signed-off-by: Andrej Valek <andrej.valek@siemens.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-devtools/nodejs/nodejs/0006-Use-target-ldflags.patch

@@ -0,0 +1,24 @@
+The target LDFLAGS have been ignored. Tools like torque
+have been loaded from system libraries, even if a native
+one was the target.
+|$ ldd torque 
+|    libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1
+|    libcrypto.so.1.1 => /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1
+|    libssl.so.1.1 => /usr/lib/x86_64-linux-gnu/libssl.so.1.1
+|    libicui18n.so.63 => not found
+|    libicuuc.so.63 => not found
+...
+
+Signed-off-by: Andrej Valek <andrej.valek@siemens.com>
+
+diff -Naur node-v10.15.1/deps/v8/gypfiles/toolchain.gypi node-v10.15.1/deps/v8/gypfiles/toolchain.gypi
+--- node-v10.15.1/deps/v8/gypfiles/toolchain.gypi	2019-03-18 15:01:39.000000000 +0100
++++ node-v10.15.1/deps/v8/gypfiles/toolchain.gypi	2019-03-18 15:04:08.628361308 +0100
+@@ -1106,6 +1106,7 @@
+             'cflags': [ '-fno-strict-aliasing' ],
+           }],
+         ],  # conditions
++        'ldflags+': [ '$(LDFLAGS)' ],
+       }],
+       ['OS=="solaris"', {
+         'defines': [ '__C99FEATURES__=1' ],  # isinf() etc.

meta-oe/recipes-devtools/nodejs/nodejs_10.15.1.bb

@@ -17,6 +17,7 @@ SRC_URI = "http://nodejs.org/dist/v${PV}/node-v${PV}.tar.xz \
            file://0003-Crypto-reduce-memory-usage-of-SignFinal.patch \
            file://0004-Make-compatibility-with-gcc-4.8.patch \
            file://0005-Link-atomic-library.patch \
+           file://0006-Use-target-ldflags.patch \
            "
 SRC_URI_append_class-target = " \
            file://0002-Using-native-torque.patch \