flashrom: strip leading whitespace from PROGRAMMER_ARGS

Newer version of meson do not allow empty arguments.

Signed-off-by: Federico Capoano <f.capoano@openwisp.io>

utils/flashrom/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=flashrom
 PKG_VERSION:=1.3.0
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-v$(PKG_VERSION).tar.bz2
 PKG_SOURCE_URL:=https://download.flashrom.org/releases

utils/flashrom/flashrom.mk

@@ -96,9 +96,8 @@ else
   $(eval $(call Programmer,satamv,$(FLASHROM_PCI)))
 endif
 
-comma := ,
 MESON_ARGS += \
 	-Ddefault_programmer_name=$(DEFAULT_PROGRAMMER_NAME) \
-	-Dprogrammer=$(subst $() $(),$(comma),$(PROGRAMMER_ARGS)) \
+	-Dprogrammer=$(subst $(space),$(comma),$(strip $(PROGRAMMER_ARGS))) \
 	-Dwerror=false \
 	-Dtests=disabled