[Flang][OpenMP] Fix hardcoded library extension in tests (#162290)

Author: ceseo

flang/test/Examples/omp-atomic.f90

@@ -1,6 +1,6 @@
 ! REQUIRES: plugins, examples, shell
 
-! RUN: %flang_fc1 -load %llvmshlibdir/flangOmpReport.so -plugin flang-omp-report -fopenmp %s -o - | FileCheck %s
+! RUN: %flang_fc1 -load %llvmshlibdir/flangOmpReport%pluginext -plugin flang-omp-report -fopenmp %s -o - | FileCheck %s
 
 ! Check OpenMP 2.13.6 atomic Construct
 

flang/test/Examples/omp-declarative-directive.f90

@@ -1,6 +1,6 @@
 ! REQUIRES: plugins, examples, shell
 
-! RUN: %flang_fc1 -load %llvmshlibdir/flangOmpReport.so -plugin flang-omp-report -fopenmp %s -o - | FileCheck %s
+! RUN: %flang_fc1 -load %llvmshlibdir/flangOmpReport%pluginext -plugin flang-omp-report -fopenmp %s -o - | FileCheck %s
 
 ! Check OpenMP declarative directives
 

flang/test/Examples/omp-device-constructs.f90

@@ -1,6 +1,6 @@
 ! REQUIRES: plugins, examples, shell
 
-!RUN: %flang_fc1 -load %llvmshlibdir/flangOmpReport.so -plugin flang-omp-report -fopenmp %s -o - | FileCheck %s
+!RUN: %flang_fc1 -load %llvmshlibdir/flangOmpReport%pluginext -plugin flang-omp-report -fopenmp %s -o - | FileCheck %s
 
 ! Check OpenMP clause validity for the following directives:
 !     2.10 Device constructs

flang/test/Examples/omp-in-reduction-clause.f90

@@ -1,6 +1,6 @@
 ! REQUIRES: plugins, examples, shell
 
-! RUN: %flang_fc1 -load %llvmshlibdir/flangOmpReport.so -plugin flang-omp-report -fopenmp -fopenmp-version=50 %s -o - | FileCheck %s
+! RUN: %flang_fc1 -load %llvmshlibdir/flangOmpReport%pluginext -plugin flang-omp-report -fopenmp -fopenmp-version=50 %s -o - | FileCheck %s
 
 ! Check for IN_REDUCTION() clause on OpenMP constructs
 

flang/test/Examples/omp-nowait.f90

@@ -1,6 +1,6 @@
 ! REQUIRES: plugins, examples, shell
 
-! RUN: %flang_fc1 -load %llvmshlibdir/flangOmpReport.so -plugin flang-omp-report -fopenmp %s -o - | FileCheck %s
+! RUN: %flang_fc1 -load %llvmshlibdir/flangOmpReport%pluginext -plugin flang-omp-report -fopenmp %s -o - | FileCheck %s
 
 subroutine sb(n)
 implicit none

flang/test/Examples/omp-order-clause.f90

@@ -1,6 +1,6 @@
 ! REQUIRES: plugins, examples, shell
 
-! RUN: %flang_fc1 -load %llvmshlibdir/flangOmpReport.so -plugin flang-omp-report -fopenmp -fopenmp-version=50 %s -o - | FileCheck %s
+! RUN: %flang_fc1 -load %llvmshlibdir/flangOmpReport%pluginext -plugin flang-omp-report -fopenmp -fopenmp-version=50 %s -o - | FileCheck %s
 
 ! Check for ORDER([order-modifier :]concurrent) clause on OpenMP constructs
 

flang/test/Examples/omp-sections.f90

@@ -1,6 +1,6 @@
 ! REQUIRES: plugins, examples, shell
 
-! RUN: %flang_fc1 -load %llvmshlibdir/flangOmpReport.so -plugin flang-omp-report -fopenmp %s -o - | FileCheck %s
+! RUN: %flang_fc1 -load %llvmshlibdir/flangOmpReport%pluginext -plugin flang-omp-report -fopenmp %s -o - | FileCheck %s
 
 subroutine omp_sections()
   integer :: x