package/libscrypt: fix CFLAGS

Don't pass TARGET_CONFIGURE_OPTS in LIBSCRYPT_MAKE_OPTS to avoid
overriding CFLAGS (and so loossing -fPIC). This will fix the following
build failure raised since bump to version 1.22 in commit
4542c6714d3951070c31739d24e4bd42b446fbae:

/home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/bin/../lib/gcc/microblazeel-buildroot-linux-uclibc/10.3.0/../../../../microblazeel-buildroot-linux-uclibc/bin/ld: BFD (GNU Binutils) 2.36.1 assertion fail elf32-microblaze.c:1534
/home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/bin/../lib/gcc/microblazeel-buildroot-linux-uclibc/10.3.0/../../../../microblazeel-buildroot-linux-uclibc/bin/ld: sha256.o: probably compiled without -fPIC?
/home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/bin/../lib/gcc/microblazeel-buildroot-linux-uclibc/10.3.0/../../../../microblazeel-buildroot-linux-uclibc/bin/ld: final link failed: bad value

Fixes:
 - http://autobuild.buildroot.org/results/ba4234ad305badb5ce815080ddcad6727e8d51c4

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/libscrypt/libscrypt.mk

@@ -11,7 +11,7 @@ LIBSCRYPT_LICENSE_FILES = LICENSE
 LIBSCRYPT_INSTALL_STAGING = YES
 
 LIBSCRYPT_MAKE_OPTS = \
-	$(TARGET_CONFIGURE_OPTS) \
+	CC=$(TARGET_CC) \
 	CFLAGS_EXTRA="$(TARGET_CFLAGS)" \
 	LDFLAGS_EXTRA="$(TARGET_LDFLAGS)" \
 	PREFIX=/usr