Refine offset pattern

When compiling with -ggdb3 the output includes an extraneous EQU from
vpx_ports/asm_offsets.h

https://trac.macports.org/ticket/33285

Change-Id: Iba93ddafec414c152b87001a7542e7a894781231

libs.mk

@@ -280,19 +280,21 @@ $(filter %$(ASM).o,$(OBJS-yes)): $(BUILD_PFX)vpx_config.asm
 # Calculate platform- and compiler-specific offsets for hand coded assembly
 #
 
+OFFSET_PATTERN:='^[a-zA-Z0-9_]* EQU'
+
 ifeq ($(filter icc gcc,$(TGT_CC)), $(TGT_CC))
     $(BUILD_PFX)asm_com_offsets.asm: $(BUILD_PFX)$(VP8_PREFIX)common/asm_com_offsets.c.S
-	grep -w EQU $< | tr -d '$$\#' $(ADS2GAS) > $@
+	grep $(OFFSET_PATTERN) $< | tr -d '$$\#' $(ADS2GAS) > $@
     $(BUILD_PFX)$(VP8_PREFIX)common/asm_com_offsets.c.S: $(VP8_PREFIX)common/asm_com_offsets.c
     CLEAN-OBJS += $(BUILD_PFX)asm_com_offsets.asm $(BUILD_PFX)$(VP8_PREFIX)common/asm_com_offsets.c.S
 
     $(BUILD_PFX)asm_enc_offsets.asm: $(BUILD_PFX)$(VP8_PREFIX)encoder/asm_enc_offsets.c.S
-	grep -w EQU $< | tr -d '$$\#' $(ADS2GAS) > $@
+	grep $(OFFSET_PATTERN) $< | tr -d '$$\#' $(ADS2GAS) > $@
     $(BUILD_PFX)$(VP8_PREFIX)encoder/asm_enc_offsets.c.S: $(VP8_PREFIX)encoder/asm_enc_offsets.c
     CLEAN-OBJS += $(BUILD_PFX)asm_enc_offsets.asm $(BUILD_PFX)$(VP8_PREFIX)encoder/asm_enc_offsets.c.S
 
     $(BUILD_PFX)asm_dec_offsets.asm: $(BUILD_PFX)$(VP8_PREFIX)decoder/asm_dec_offsets.c.S
-	grep -w EQU $< | tr -d '$$\#' $(ADS2GAS) > $@
+	grep $(OFFSET_PATTERN) $< | tr -d '$$\#' $(ADS2GAS) > $@
     $(BUILD_PFX)$(VP8_PREFIX)decoder/asm_dec_offsets.c.S: $(VP8_PREFIX)decoder/asm_dec_offsets.c
     CLEAN-OBJS += $(BUILD_PFX)asm_dec_offsets.asm $(BUILD_PFX)$(VP8_PREFIX)decoder/asm_dec_offsets.c.S
 else