remove use of make variable SOLARIS_MAKE from makefiles, not used anymore

Seen here:

./j2se/make/common/shared/Defs-utils.gmk: # Setting up SOLARIS_MAKE, for using the native make rather
./j2se/make/common/shared/Defs-utils.gmk: SOLARIS_MAKE = $(UTILS_CCS_BIN_PATH)make
./j2se/make/common/shared/Defs-utils.gmk: # Setting up SOLARIS_MAKE, for using the native make rather
./j2se/make/common/shared/Defs-utils.gmk: SOLARIS_MAKE = $(UTILS_CCS_BIN_PATH)make

but not used anywhere.