disable gb_COMPILEROPTFLAGS in debug mode

This means that modules where --enable-selective-debuginfo disables -g
do not revert back to -O just because -g is not wanted there. As this
will presumably happen with modules the developer does not care about,
there's no gain from the -O and the compile there would take longer.

Change-Id: Ied84d2f69035d6580279b0657c5a5ba5440c6f16

solenv/gbuild/platform/solaris.mk

@@ -154,7 +154,12 @@ endif
 
 gb_DEBUG_CFLAGS := -ggdb2 -finline-limit=0 -fno-inline -fno-default-inline
 
+ifneq ($(gb_DEBUGLEVEL),0)
+gb_COMPILEROPTFLAGS :=
+else
 gb_COMPILEROPTFLAGS := $(gb_COMPILERDEFAULTOPTFLAGS)
+endif
+
 gb_COMPILERNOOPTFLAGS := -O0
 
 # LinkTarget class

solenv/gbuild/platform/unxgcc.mk

@@ -153,7 +153,12 @@ else
 gb_LINKEROPTFLAGS := -Wl,-O1
 endif
 
+ifneq ($(gb_DEBUGLEVEL),0)
+gb_COMPILEROPTFLAGS :=
+else
 gb_COMPILEROPTFLAGS := $(gb_COMPILERDEFAULTOPTFLAGS)
+endif
+
 gb_COMPILERNOOPTFLAGS := -O0
 
 gb_LINKERSTRIPDEBUGFLAGS := -Wl,-S