TQt buildkey with GCC >= 7

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Hello to all developers,

following the arrival of GCC 8.x, I began to address the build key update 
in TQt. See the patch that was pushed for GCC 7.x:

  https://mirror.git.trinitydesktop.org/cgit/tqt3/commit/?id=71d8f1c4

Now I noticed that starting with GCC7, the compiler reports the version in 
a different way. Previously, gcc -dumpversion returned for example: 
6.3.0. Now, regardless of the specific version of GCC 7.x or 8.x, it 
simply return: 7 or 8.

Because the binary programs are compatible, the expression "7.*|6.*|5.*|
4.*)" in the configuration assured that for the GCC from 4.x to 6.x the 
build key was generated as follows:

#define TQT_BUILD_KEY "x86_64 Linux g++-4.* full-config"

But the gcc -dumpversion behavior change in GCC >= 7 has caused that the 
expression in the configuration not to be applied to GCC versions >= 7 
and the build key is generated as follows:

#define TQT_BUILD_KEY "x86_64 Linux g++-7 full-config"

I believe that when binary programs are still compatible, we want to keep 
the build key identical (x86_64 Linux g++-4.* full-config), and I suggest 
modifying the expression in the configuration as follows:

--- a/configure
+++ b/configure
@@ -2818,7 +2818,7 @@ g++*)
     3.*)
        COMPILER_VERSION="3.*"
        ;;
-    7.*|6.*|5.*|4.*)
+    [7-8]|[4-6].*)
        COMPILER_VERSION="4.*"
        ;;
     *)

Please, what is your opinion?

Cheers
-- 
Slávek

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