Add missing GCC version flags to the Makefile

(cherry picked from commit 00943e9e82ff46a97a2bc1e3179ce47e53345cc3)

src/Makefile.cfg

@@ -12,11 +12,12 @@
 # to avoid a false positive with the version detection...
 
 SUPPORTED_GCC_VERSIONS:=\
-	91\
+	101 102\
-	81 82 83\
+	91 92 93\
-	71 72\
+	81 82 83 84\
+	71 72 73 74 75\
 	61 62 63 64\
-	51 52 53 54\
+	51 52 53 54 55\
 	40 41 42 43 44 45 46 47 48 49
 
 LATEST_GCC_VERSION=9.1
@@ -68,7 +69,27 @@ ifeq   (,$(filter GCC%,$(.VARIABLES)))
  endif
 endif
 
+ifdef GCC102
+GCC101=1
+endif
+
+ifdef GCC101
+GCC93=1
+endif
+
+ifdef GCC93
+GCC92=1
+endif
+
+ifdef GCC92
+GCC91=1
+endif
+
 ifdef GCC91
+GCC84=1
+endif
+
+ifdef GCC84
 GCC83=1
 endif
 
@@ -81,6 +102,18 @@ GCC81=1
 endif
 
 ifdef GCC81
+GCC75=1
+endif
+
+ifdef GCC75
+GCC74=1
+endif
+
+ifdef GCC74
+GCC73=1
+endif
+
+ifdef GCC73
 GCC72=1
 endif
 
@@ -105,6 +138,10 @@ GCC61=1
 endif
 
 ifdef GCC61
+GCC55=1
+endif
+
+ifdef GCC55
 GCC54=1
 endif