targets/*.conf cleanup: remove unnecessary TPUDRV_blob= lines MAIN_blob= and/or TPUDRV_blob= may be *optionally* defined in targets/*.conf files; if either variable is defined, it means that using the specified version of the blob library is allowed on this target, albeit likely suboptimal; if the variable is not defined, then using a blob is not an option and compilation from source is required for this component. MAIN_blob= and TPUDRV_blob= are now defaulted to empty in configure.sh, thus there is no need to explicitly specify that using a blob is not a valid option.

--- a/configure.sh	Fri May 29 02:36:39 2020 +0000
+++ b/configure.sh	Fri May 29 03:11:16 2020 +0000
@@ -63,6 +63,8 @@
 DISABLE_SLEEP=0
 RVTMUX_ON_MODEM=0
 UI_CONFIG=bigcolor
+MAIN_blob=
+TPUDRV_blob=
 
 . "targets/$TARGET.conf"