leptonica: Fix passed CFLAGS

mingw-w64-leptonica/PKGBUILD

@@ -29,9 +29,8 @@ build() {
   [[ -d "${srcdir}/build-${CARCH}" ]] && rm -rf "${srcdir}/build-${CARCH}"
   mkdir "${srcdir}/build-${CARCH}"
   cd "${srcdir}/build-${CARCH}"
-  CFLAGS='-DMINIMUM_SEVERITY=L_SEVERITY_WARNING'
+  CFLAGS+=" -DMINIMUM_SEVERITY=L_SEVERITY_WARNING"
   ../${_realname}-${pkgver}/configure \
-    -v \
     --disable-dependency-tracking \
     --disable-silent-rules \
     --build=${MINGW_CHOST} \