[FIX] Corrected bitness check for 64-bit systems (#1680)

Co-authored-by: AhmedYasserrr <ahmdyasrj@gamil.com>

Author: AhmedYasserrr

linux/build

@@ -31,7 +31,7 @@ done
 
 BLD_FLAGS="$BLD_FLAGS -std=gnu99 -Wno-write-strings -Wno-pointer-sign -D_FILE_OFFSET_BITS=64 -DVERSION_FILE_PRESENT -DENABLE_OCR -DFT2_BUILD_LIBRARY -DGPAC_DISABLE_VTT -DGPAC_DISABLE_OD_DUMP -DGPAC_DISABLE_REMOTERY -DNO_GZIP"
 bit_os=$(getconf LONG_BIT)
-if [ "$bit_os"=="64" ]
+if [ "$bit_os" == "64" ]
 then
     BLD_FLAGS="$BLD_FLAGS -DGPAC_64_BITS"
 fi