libtomcrypt: fix build without wchar

GCC defines wchar_t even when wchar support is disabled in uClibc. The
LTC_NO_WCHAR macro triggers a local definition of wchar_t that conflicts
with the GCC defined one. Remove LTC_NO_WCHAR to avoid that.

See also https://github.com/libtom/libtomcrypt/issues/313 for more
discussion about this.

Fixes:
http://autobuild.buildroot.net/results/4ff/4ffb593185f7520d2d9a9cc988aa9c510f253930/

Cc: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/libtomcrypt/libtomcrypt.mk

@@ -13,8 +13,7 @@ LIBTOMCRYPT_INSTALL_STAGING = YES
 LIBTOMCRYPT_INSTALL_TARGET = NO # only static library
 LIBTOMCRYPT_DEPENDENCIES = libtommath
 
-LIBTOMCRYPT_CFLAGS = -I./src/headers $(TARGET_CFLAGS) -DLTC_SOURCE -DLTM_DESC \
-	$(if $(BR2_USE_WCHAR),,-DLTC_NO_WCHAR)
+LIBTOMCRYPT_CFLAGS = -I./src/headers $(TARGET_CFLAGS) -DLTC_SOURCE -DLTM_DESC
 
 define LIBTOMCRYPT_BUILD_CMDS
 	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D) $(TARGET_CONFIGURE_OPTS) CFLAGS="$(LIBTOMCRYPT_CFLAGS)"