sentencepiece: remove dependency on tcmalloc

Signed-off-by: Paul Guyot <pguyot@kallisys.net>

textproc/sentencepiece/Portfile

@@ -7,7 +7,7 @@ PortGroup           github 1.0
 # If you update this port, also update the py-sentencepiece to latest version.
 # `py-sentencepiece` is closely coupled to `sentencepiece`.
 github.setup        google sentencepiece 0.2.1 v
-revision            0
+revision            1
 checksums           rmd160  98e5b47ff08d9b0c83f78b7b4bc38ad399343058 \
                     sha256  c1a59e9259c9653ad0ade653dadff074cd31f0a6ff2a11316f67bee4189a8f1b \
                     size    13485527
@@ -32,13 +32,13 @@ long_description    SentencePiece is an unsupervised text tokenizer \
 
 github.tarball_from archive
 
-depends_lib-append  port:gperftools \
-                    port:protobuf3-cpp
+depends_lib-append  port:protobuf3-cpp
 
 compiler.cxx_standard           2017
 compiler.thread_local_storage   yes
 
-configure.args      -DSPM_USE_BUILTIN_PROTOBUF=OFF
+configure.args      -DSPM_ENABLE_TCMALLOC=OFF \
+                    -DSPM_USE_BUILTIN_PROTOBUF=OFF
 
 platform darwin {
     if {[string match *gcc* ${configure.compiler}]} {