1) Allow recipe to overide optimization.

fixes:

397 | #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
|       |    ^~~~~~~
| cc1: all warnings being treated as errors

2) Allow recipe to override OE related compile-/link-flags

fixes:

ERROR: QA Issue: File /usr/bin/tpm_server in package ibmswtpm2 doesn't have GNU_HASH (didn't pass LDFLAGS?) [ldflags]

Upstream-Status: OE specific

Signed-off-by: Jens Rehsack <sno@NetBSD.org>

Index: src/makefile
===================================================================
--- src.orig/makefile
+++ src/makefile
@@ -38,12 +38,10 @@
 #################################################################################
 
 
-CC = /usr/bin/gcc
-
 CCFLAGS = -Wall  			\
 	-Wmissing-declarations -Wmissing-prototypes -Wnested-externs \
 	-Werror -Wsign-compare \
-	 -c -ggdb -O0 			\
+	 -c -ggdb -O 			\
 	-DTPM_POSIX			\
 	-D_POSIX_			\
 	-DTPM_NUVOTON
@@ -79,11 +77,11 @@
 .PRECIOUS:	%.o
 
 tpm_server:	$(OBJFILES)
-		$(CC) $(OBJFILES) $(LNFLAGS) -o tpm_server
+		$(CCLD) $(OBJFILES) $(LDFLAGS) $(LNFLAGS) -o tpm_server
 
 clean:		
 		rm -f *.o tpm_server *~
 
 %.o:		%.c
-		$(CC) $(CCFLAGS) $< -o $@
+		$(CC) $(CCFLAGS) $(CFLAGS) $< -o $@