arm/trusted-firmware-a,fiptool-native: Fix fiptool execution wrt corstone1000

After http://git.yoctoproject.org/cgit/cgit.cgi/meta-arm/commit/?id=648571b113b39420735859461fcd69cfc6f66c76,
building the corstone1000-image fails with the below error.
    fiptool_platform.h:19:11: fatal error: openssl/sha.h: No such file or directory
    # include <openssl/sha.h>

Put back the inclusion of BUILD_LDFLAGS to fix this.

Change-Id: I57396eefe2c9a58e4c5c6a751b2ee7d32509cac5
Signed-off-by: Arpita S.K <Arpita.S.K@arm.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>

meta-arm/recipes-bsp/trusted-firmware-a/trusted-firmware-a.inc

@@ -155,6 +155,7 @@ do_compile() {
     # This is still needed to have the native fiptool executing properly by
     # setting the RPATH
     sed -i '/^LDLIBS/ s,$, \$\{BUILD_LDFLAGS},' ${S}/tools/fiptool/Makefile
+    sed -i '/^INCLUDE_PATHS/ s,$, \$\{BUILD_CFLAGS},' ${S}/tools/fiptool/Makefile
 
     # Currently there are races if you build all the targets at once in parallel
     for T in ${TFA_BUILD_TARGET}; do

meta-arm/recipes-devtools/fiptool/fiptool-native_2.5.bb

@@ -22,6 +22,7 @@ do_compile () {
     # This is still needed to have the native fiptool executing properly by
     # setting the RPATH
     sed -i '/^LDLIBS/ s,$, \$\{BUILD_LDFLAGS},' ${S}/tools/fiptool/Makefile
+    sed -i '/^INCLUDE_PATHS/ s,$, \$\{BUILD_CFLAGS},' ${S}/tools/fiptool/Makefile
 
     oe_runmake fiptool
 }