Ensure all tools are building with -Wall and -Werror

Added -Wall to ALL_CFLAGS

Change-Id: I0d85c7f333b5e56f144f4a605ea639668fdc5710
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
diff --git a/libmapper/Makefile b/libmapper/Makefile
index 2f71515..128a032 100644
--- a/libmapper/Makefile
+++ b/libmapper/Makefile
@@ -10,7 +10,8 @@
 INCLUDES=mapper.h
 
 LDLIBS+=$(shell pkg-config --libs $(PACKAGE_DEPS))
-ALL_CFLAGS+=$(shell pkg-config --cflags $(PACKAGE_DEPS)) -fPIC -Werror $(CFLAGS)
+ALL_CFLAGS+=$(shell pkg-config --cflags $(PACKAGE_DEPS)) \
+	-fPIC -Wall -Werror $(CFLAGS)
 
 all: $(SONAME) $(BIN)