BaseTools/tools_def.template: propagate loss of GCC44 references

BaseTools/tools_def.template: propagate loss of GCC44 references

The last patch decremented references on a number of DEFs. They can be
classified into three groups:

(a) those that remain used by multiple toolchains, or by multiple
definitions of a given toolchain (refcount >= 2):

- GCC_ASLCC_FLAGS
- GCC_ASLPP_FLAGS
- GCC_HOST_PREFIX
- GCC_IA32_RC_FLAGS
- GCC_PP_FLAGS
- GCC_VFRPP_FLAGS
- GCC_X64_RC_FLAGS
- IASL_FLAGS
- IASL_OUTFLAGS
- UNIX_IASL_BIN
- GCC44_IA32_X64_DLINK_FLAGS (!)

(b) those that are only used by GCC48 (refcount == 1):

- GCC44_ASM_FLAGS
- GCC44_IA32_CC_FLAGS
- GCC44_IA32_DLINK2_FLAGS
- GCC44_IA32_X64_ASLDLINK_FLAGS
- GCC44_X64_CC_FLAGS
- GCC44_X64_DLINK2_FLAGS
- GCC44_X64_DLINK_FLAGS

(c) those that are no longer used (refcount == 0):

- GCC44_IA32_PREFIX
- GCC44_X64_PREFIX

For the members of class (b), expand their definitions at the referring
sites, and remove their definitions.

For the members of class (c), remove their definitions.

(It's easier to review this patch with "git show --word-diff".)

Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1377
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>