[Buildroot] [git commit branch/2022.05.x] package/apg: fix musl static build

[Peter Korsgaard]

commit: https://git.buildroot.net/buildroot/commit/?id=5e55b592fd22c6c413b9e2e3cd22e1e7f43e55e6
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2022.05.x

Drop APG_CFLAGS (which is empty) to correctly set CFLAGS with
TARGET_CFLAGS (which will contain -static) passed by
TARGET_CONFIGURE_OPTS. Moreover, pass TARGET_CFLAGS to FLAGS which is
used to build apgbfm. This will fix the following musl static build
failure raised since the addition of the package in commit
99eb1a7019a4333f99e93b844962db301a8c3f98:

/home/buildroot/autobuild/instance-2/output-1/host/lib/gcc/armeb-buildroot-linux-musleabi/10.3.0/../../../../armeb-buildroot-linux-musleabi/bin/ld: /home/buildroot/autobuild/instance-2/output-1/host/lib/gcc/armeb-buildroot-linux-musleabi/10.3.0/libgcc.a(_dvmd_lnx.o): in function `__aeabi_ldiv0':
/home/buildroot/autobuild/instance-2/output-1/build/host-gcc-final-10.3.0/build/armeb-buildroot-linux-musleabi/libgcc/../../../libgcc/config/arm/lib1funcs.S:1499: undefined reference to `raise'

Fixes:
 - http://autobuild.buildroot.org/results/0e53957965363ceb7141bf8a612998abec893b17

Signed-off-by: Fabrice Fontaine <fontaine.fabrice at gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni at bootlin.com>
(cherry picked from commit 35b35d90b1e393f580b6a0497a561d8a7a55d563)
Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
---
 package/apg/apg.mk | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/package/apg/apg.mk b/package/apg/apg.mk
index ac4dce77f9..16661f4b8d 100644
--- a/package/apg/apg.mk
+++ b/package/apg/apg.mk
@@ -10,8 +10,7 @@ APG_LICENSE = BSD-3-Clause
 APG_LICENSE_FILES = COPYING
 
 define APG_BUILD_CMDS
-	$(MAKE) $(TARGET_CONFIGURE_OPTS) CFLAGS="$(APG_CFLAGS)" \
-		-C $(@D)
+	$(MAKE) $(TARGET_CONFIGURE_OPTS) FLAGS="$(TARGET_CFLAGS)" -C $(@D)
 endef
 
 define APG_INSTALL_TARGET_CMDS