package/procrank_linux: fix static build

Pass TARGET_CFLAGS which will contain -static to fix the following
static build failure:

/home/buildroot/autobuild/instance-0/output-1/host/bin/sh4a-buildroot-linux-musl-gcc -Wall procrank.c -Ilibpagemap/include -Llibpagemap -lpagemap -o procrank
/home/buildroot/autobuild/instance-0/output-1/host/lib/gcc/sh4a-buildroot-linux-musl/10.3.0/../../../../sh4a-buildroot-linux-musl/bin/ld: /home/buildroot/autobuild/instance-0/output-1/host/lib/gcc/sh4a-buildroot-linux-musl/10.3.0/libgcc.a(unwind-dw2.o): in function `size_of_encoded_value':
/home/buildroot/autobuild/instance-0/output-1/build/host-gcc-final-10.3.0/build/sh4a-buildroot-linux-musl/libgcc/../../../libgcc/unwind-pe.h:89: undefined reference to `abort'

Fixes:
 - http://autobuild.buildroot.org/results/8eccc34c99a75501179fe93a80646cc684261ff4

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
(cherry picked from commit 22b7fb8a8d86ae5ba9d247e919f94f400bc225f0)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/procrank_linux/procrank_linux.mk

@@ -10,7 +10,8 @@ PROCRANK_LINUX_LICENSE = Apache-2.0
 PROCRANK_LINUX_LICENSE_FILES = NOTICE
 
 define PROCRANK_LINUX_BUILD_CMDS
-	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D) CROSS_COMPILE="$(TARGET_CROSS)"
+	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D) CROSS_COMPILE="$(TARGET_CROSS)" \
+		LOCAL_CFLAGS="$(TARGET_CFLAGS)"
 endef
 
 define PROCRANK_LINUX_INSTALL_TARGET_CMDS