travis: add schnorrsig to valgrind and big endian platform test

Author: jonasnick

.travis.yml

@@ -36,8 +36,8 @@ env:
     - CFLAGS=-O0 CTIMETEST=
     - ECMULTGENPRECISION=2
     - ECMULTGENPRECISION=8
-    - VALGRIND=yes ENDOMORPHISM=yes BIGNUM=no ASM=x86_64 ECDH=yes  RECOVERY=yes EXTRAFLAGS="--disable-openssl-tests" CPPFLAGS=-DVALGRIND BUILD=
-    - VALGRIND=yes                  BIGNUM=no ASM=x86_64 ECDH=yes  RECOVERY=yes EXTRAFLAGS="--disable-openssl-tests" CPPFLAGS=-DVALGRIND BUILD=
+    - VALGRIND=yes ENDOMORPHISM=yes BIGNUM=no ASM=x86_64 ECDH=yes  RECOVERY=yes EXPERIMENTAL=yes SCHNORRSIG=yes EXTRAFLAGS="--disable-openssl-tests" CPPFLAGS=-DVALGRIND BUILD=
+    - VALGRIND=yes                  BIGNUM=no ASM=x86_64 ECDH=yes  RECOVERY=yes EXPERIMENTAL=yes SCHNORRSIG=yes EXTRAFLAGS="--disable-openssl-tests" CPPFLAGS=-DVALGRIND BUILD=
 matrix:
   fast_finish: true
   include:
@@ -85,7 +85,7 @@ matrix:
             - libc6-dbg:i386
     # S390x build (big endian system)
     - compiler: gcc
-      env: HOST=s390x-unknown-linux-gnu ECDH=yes RECOVERY=yes CTIMETEST=
+      env: HOST=s390x-unknown-linux-gnu ECDH=yes RECOVERY=yes EXPERIMENTAL=yes SCHNORRSIG=yes CTIMETEST=
       arch: s390x
 
 # We use this to install macOS dependencies instead of the built in `homebrew` plugin,